Premium Essay

Biology Lesson 3 Essay

In: Science

Submitted By kwilson0210
Words 385
Pages 2
Directional selection is when one extreme phenotype is favored over other phenotypes. This eventually leads to the selected phenotype to be passed from generation to generation. In contrast, disruptive selection is when two extreme phenotypes are favored over other intermediate phenotypes. An example for directional selection can be found when it comes to the color of mice. Mice can range anywhere in color from white to dark brown, in directional selection, it appeared more mice that were brown were surviving so in turn, more brown mice were reproducing and white mice were becoming rare. Disruptive selection is when both the dark brown mice and the white mice are being favored over the lighter brown, causing the colors in between to be phased out. In the process of natural selection, organisms most fit for reproduction will survive. In the case of strains of bacteria, the bacteria will only be able to thrive and reproduce if the antibiotics are not able to kill it. Bacteria has a variability in that some strains are more unaffected by antibiotics than others. When certain bacteria are found to survive despite antibiotics, these bacteria will reproduce and pass on that trait because it makes then a more fit organism. The major evolutionary trends that allowed for aquatic vertebrates become terrestrial was the development of feet and legs rather than fins. When water was scares, aquatic animals would die out because the water was too shallow to survive, thus legs and feet were better adapted to get around in such environments. Aquatic plants, such as fern reproduce by having the sperm swim to another plant, plants became dependent on water in order to produce offspring. In order for this to be achieved, the eggs of the female had to be closer to the ground to enable the sperm to not have to swim as far. As plants evolved, their eggs became found on the top of the…...

Similar Documents

Premium Essay

Biology 101 Review Essay

...Bio 101 Review Sheet Test #1 (Chapters 1-3) Chapter 1 1. Cell is basic unit of life 2. Hierarchy of life figure 3. 3 Energy categories and examples of each Producer-plants and some microbes Consumer-humans and other animals Decomposer-fungi and other animals 4. Energy transfers are not 100% efficient – why? Cant capture all of the energy supplied by one source a. Where does all energy for biology come from? sun 5. Homeostasis- state of internal consistency or equilibrium 6. 2 types of reproduction asexual and sexual b. Benefits to sexual reproduction benefit of tremendous variation 7. Adaptation inherited characteristics or behaviors that enables an organism to survive and reproduce successfully in a given environment c. How it contributes to natural selection and evolution individuals with the better combinations of genes survive and reproduce 8. Evolution change in genetic makeup of a population 9. Why it’s important to take all your antibiotics so all of the bacteria can be eliminated, some of the bacteria can become stronger. 10. Taxonomy classification of life’s diversity 11. What our species name is homo sapiens 12. Order of taxonomic categories – mnemonic device! Domain, kingdom, phylum, class, order, family, genus, species 13. 3 domains bacteria, archaea, eukaryote d. Basic differences e. What our domain is f. What domain universal ancestor likely is in archaea ...

Words: 1102 - Pages: 5

Free Essay

Lesson 3

...ITCS215: Lesson Three Worksheet | Student Name: Instructions: This worksheet will assist you in completing your assignments for this week. Save this worksheet as lastname_Lesson3.docx and submit. You are required to complete all sections indicated by red brackets. You will replace the red brackets and text with the indicated material. For example, for the “Student Name” section above, a completed response would look like this: Student Name: When responding with text, please leave the text red so that your instructor will be able to find your responses easily. When pasting an image, please replace the red text with the image. Total Points: 37 Assignments:     Review Questions - Short Answer   Short Answer - Review Questions, Chapter 6: Questions 1, 5, 7, and 15. Student is to complete in Short Answer format: a) Define the term user view as it applies to database design. Saved queries created with SQL. User views specify which users are permitted access to what data in a database. 5. Describe the function of each of the following types of keys: primary, alternate, secondary, and foreign. Primary Key: The primary key is a attribute or a set of attributes that uniquely identify specific instance of an entity. Every entity in the data model must have a primary key whose values uniquely identify instance of the entity. Sometimes a record may contain more than one key field. Primary key is selected from one of the candidate key and......

Words: 1035 - Pages: 5

Premium Essay

Biology of Organisms Tutorial 3

...Tutorial 3 Bio 207 1) Glomerular filtration rate (gfr) is a test used to check how well the kidneys are working. Specifically, it estimates how much blood passes through the tiny filters in the kidneys each minute. These tiny filters are called glomeruli. Vasa recta is the hairpin shaped capillaries that serve the long loop of henle of juxtamedullary nephrons. Each ascending porion of the vasa recta lies next to the descending portion of a loop of henle and vice versa Although the loop of henle and the vasa recta do not exchange materials directly, they function together as a counterpart of a countercurrent system that enhances nephron efficiency. (source Campbell, Reece, et al., Biology 8th edition. 2009. Renal clearance is a measurement that allows one to analyze the activity of the kidney. Renal clearance = urine concentration (M) x urine flow rate (ml/min)/plasma concentration (M)= UV/P RCGFR=secretion RC=GFR = nothing is secreted or absorbed. (source: www.austince.edu/emeyerthclearancehtm.htm) Single effect is produced by the use of metabolic energy between adjacent parts of the two oppositely flowing fluid streams in a counter current multiplier system (Source: Hill, Wyse and Anderson, Animal Physiology 2012) 2) Blood enters the kidneys through the bowman’s capsule where it enters a cluster of blood capillaries called the glomerulus. Fluid is driven through a filter in the glomerulus into the capsule’s lumen by the hydrostatic pressure of the blood. The fluid......

Words: 989 - Pages: 4

Free Essay

Lessons Learned-3 Idiots

...Humility Entrepreneurship Teamwork 3 Idiots- Life’s Learning Idiots Life s by Ramki Deliver The Promise Learning Social Responsibility Respect for Individual Humility Entrepreneurship Teamwork 1. Never t t be successful , pursue excellence 1 N try to b f l ll  Success is the bye product & the result  Excellence always creates Success & it is a process of continual improvement  Never run after success  Let it happen automatically in life Deliver The Promise Learning Social Responsibility Respect for Individual Humility Entrepreneurship Teamwork 2. Freedom t Lif Lif is b 2 F d to Life- Life i beautiful tif l  Don’t die before the actual death  Live every moment to the fullest as if today is the last day  Life is gifted to humankind to live  Live & Live happily towards happiness Deliver The Promise Learning Social Responsibility Respect for Individual Humility Entrepreneurship Teamwork 3. Passion l d t E 3 P i leads to Excellence ll  When your hobby becomes your profession , the passion becomes your profession  You will be able to lead up to excellence in life  Satisfaction, Joy, Pleasure & love will be the outcome of the passion  Following your passion for years , you will surely become somebody one day Deliver The Promise Learning Social Responsibility Respect for Individual Humility Entrepreneurship Teamwork 4. Learning i very simple- N 4 L i is i l Never stop......

Words: 887 - Pages: 4

Free Essay

Lesson 3 Knowledge Assessment

...Knowledge Assessment Lesson 3 1. uses two or more drives used in combination to create a fault-tolerant system. 2. is a commonly used RAID technology that does not provide fault tolerance. 3. A(n) is an extra drive that can be automatically swapped when a drive fails. 4. A(n) is an architecture used for disk arrays, tape libraries, and optical jukeboxes based on networking technology. 5. The sends SCSI commands to a SAN over a TCP/IP network. 6. The is a Windows Server 2008 feature that allows you to create and manage logical unit numbers (LUNs) on both Fibre Channel and iSCSI disk storage subsystems that support VDS. 7. A(n) is a method of storing and organizing computer files so that you can easily find them and access them. 8. NTFS can support up to of storage space for each volume. 9. The program is the command interface to partition drives. 10. A(n) uses volumes stored on two separate physical disks to write data onto both disks simultaneously and redundantly. Lesson 6 1. To print to a printer, you need the permission. 2. The NTFS special permission that allows you to move through a folder to reach lower files or folders is . 3. The Windows component that allows you to manage shares and NTFS permissions is . 4. Permissions that flow from a parent......

Words: 308 - Pages: 2

Premium Essay

Essay 3

...Ashraf Shaikh English 711 Essay Assignment #3 Elizabeth Spencer 22nd April 2015 Bilingual Education or Not? The debate on whether United States should adopt the bilingual academic program whereby children speaking other languages are taught in two languages, in English and in a second, native language (Hayakawa, 1991). There have been studies and researches indicating the benefits of the bilingual academic program, particularly to the students – such as high academic scores, mental flexibility, improved personal identity etc. At the same time, there is evidence showing a number of downsides to the programs – such as double expense to the government, politicized aspects etc. The aim of this paper is to examine different aspects of the argument on the subject of bilingual programs in schools, and whether United States should make English as its official language. It also demonstrates the argumentative ability regarding the controversial issue of bilingual academic program in the United States. Honestly, I feel that the need to make English the official language of the country is preposterous. Only, because it practically is the main language of the country just unofficially. From a general point of view, the definition of bilingualism is whereby a person possesses the ability of easily and naturally speaking in two languages, without experiencing any problem whatsoever. However, from the context of United States of America, bilingualism has a controversial definition......

Words: 1495 - Pages: 6

Free Essay

Biology 330 Essay

...demonstrated evidence of laboratory defects in blood clotting in Aaron  Chan   Biology  330   06261560     1893. Our forces strengthened exponentially in 1937 after Patek and Taylor found the role of the soon to be named factor VIII describing its action in hemostasis. They characterized and named it an “antihemophilic globulin substance”. Not long after, the protein was purified and the gene was open to study for many scientists. The root of this evil The mastermind behind Hemophilia A is the gene coagulant factor VIII. The factor VIII gene sits on the long arm of chromosome 10 at location 28, more specifically, from base pairs 154,064,062 to 154,255,350. Its protein sequence is 2351 amino acids long transcribed from a 191,288 mRNA. This gene produces two alternatively spliced transcripts. Transcript variant 1 consists of 26 exons that encodes a large glycoprotein called isoform a, which circulates in the plasma and undergoes multiple cleavage events. Transcript variant 2 encodes a small protein, isoform b, which consists of a unique 5' exon located within intron 22 of transcript variant 1. This exon codes for eight amino acids and is spliced to exons 2326 maintaining the reading frame. It is composed primarily of the phospholipid-binding domain of factor VIIIc. This binding domain is essential Aaron  Chan   Biology  330   06261560     for coagulant activity. Normally this gene,......

Words: 2699 - Pages: 11

Premium Essay

Biology Essay Questions

...Essay Questions 10/11/15 1. Directional selection occurs when one of the extreme traits of distribution is eliminated and causing a shift in the frequency. For example, the beak length of finches changed due to the food sources that were available. The finches with larger beaks survived because they were able to crack seeds that they could eat. As time went on, insects became plentiful and now finches with smaller beaks were now favored by the directional selection. Disruptive selection occurs when the average phenotype is selected against. For example, in a population of white, grey, and black rabbits if the grey rabbit dies the white and black rabbits become concentrated. 2. Populations of bacteria evolve to become resistant to antibiotics through the process of natural selection. When a population of bacteria gets exposed to any give antibiotic, most of the bacteria will die. However, if some bacteria cells have resistance due to plasmids, they will survive. They will then pass this trait to their offspring, which will be a fully resistant generation. 3. Tooth reduction is one of the major evolutionary trends that developed among major vertebrate groups that allowed for the transition from aquatic to terrestrial life. Evolution of limbs and being able to breath air are other evolutionary trends that took place. 4. The nonvascular plants and even a few vascular plants like ferns reproduce by having the sperm swim through the external environment. This......

Words: 401 - Pages: 2

Premium Essay

Essay Questions Biology

... Lesson 3 essay questions Exam # 25085400 1. Directional and disruptive selection can be compared because they both favor extreme phenotypes, they adjust to their environments over time and they both cause a shift in the distribution curve. The contrast in directional selection is the distribution curve shifts one way and only focuses on one extreme phenotype. An example of directional selection would be the gradual increase in size of the modern horse. This change occurred due to the environment changing from forest conditions to grassland conditions. The contrast in disruptive selection is the distribution curve shifts both ways and focuses on two or more phenotypes versus intermediate phenotypes. An example of disruptive selection is the British snails. They live in low-vegetation areas and in forest areas. Thrushes feed on the the snails with dark shells and no bands in the vegetation areas and they feed on the snails with the light bands in the forest areas. Therefore, these snails had to adapt to their own environment. 2. Overuse and misuse of antibiotics can cause resistant bacteria to form through natural selection. When you introduce selective pressure (antibiotics) to a bacterial infection, some of the bacteria can acquire “free” DNA from its environment. Which can mimic the antibiotics genetic make up. This causes some bacteria to create a resistant gene that can be passed to the next generation. As a......

Words: 500 - Pages: 2

Premium Essay

Lesson 3 Essay

...Lesson 3 Essay Questions: 1- Compare and contrast directional selection and disruptive selection, and provide an example of each. Directional selection occurs when one extreme of a trait is favored and the distribution curve shifts in that direction. An example of this is the human struggle with malaria. The mosquito Anopheles transmits the disease. A new drug for the disease and a insecticide for the mosquito was created. But over the years they became resistant to it and multiplied, shifting the distribution curve toward the resistant type of parasite. Disruptive selection is where any two extremes of a trait are favored over any intermediate phenotype. For example, British land snails are found in low vegetation areas. The thrushes feed on snails with dark shells and in the forest they feed on snails with light banded shells. So each phenotype adapted to their environment. (Mader & Windelspecht, 2012) 2- Many pathogenic bacteria species are becoming resistant to antibiotics. Explain how such adaptations can develop through the process of natural selection. (Hint: Relate this example to the conditions that are necessary for natural selection to occur.) Natural selection is the process that results in adaptation of a population to the environment. This is what happens with antibiotic resistant bacteria. When antibiotic is administered, some bacteria may survive because they are genetically resistant. This bacteria will pass on their genes to the next generation. As...

Words: 635 - Pages: 3

Premium Essay

Lesson 3 - Individual Essay

...From the Meaning-Centered Approach, how is Zappos being generated through human interaction? The way to understand organizational communication is by discovering how organizational reality is generated through human interaction. The approach describes organizational communication as the process for generating shared realities that become organizing, decision-making, influence and culture. I must admit, I didn’t fully understand when Karl Weick proposed that organizations as such do not exist but are in the process of existing through on-going human interaction. Then I thought about it and was like, he’s right. Organizations are social systems and can only exist when human interaction exists. In other words, if there’s no communication there’s no organization. It’s evident in both videos that value is placed on the employees which spills over to customer service. The corporate culture is much more than a set of values but a web of human interactions. It’s all about how the business gets done. Employees share the same core values and share in the responsibility of delivering happiness to the customers. The company doesn’t focus on customer service but on the culture of the company. Employees have the same shared practices and realities which is how they create and shape the company. The influence comes from the CEO Tony Hsieh. In the video, the CEO talks we not I. He doesn’t have his own office but instead shares a space among his employees. His......

Words: 972 - Pages: 4

Premium Essay

Lesson 5 Essay Questions for Penn Foster Biology

...“crash” when they run out of food, space, oxygen, sunlight, or whatever the limiting factors is in that environment. Examples are most insects, and corals, barnacles, clams, scallops, and oysters, who spawn and fertilize their eggs in the water. Equilibrium species use the K-strategy. The carrying capacity of the environment. These species produce much fewer offspring and usually brood them and/or take care of them in other ways. The populations of these species may first grow exponentially, but the growth levels off when they reach the carrying capacity of the environment. They prefer a stable predictable environment and have a long life cycle. Most birds and mammals use this strategy, as well as some live-bearing fish like dogfish sharks. 3. Compare and contrast indirect versus direct values of biodiversity, and provide examples. 4. Describe two traits that represent a sustainable society and two traits of a non-sustainable society. Two traits that represent a sustainable society would be heterosexual population and capitalism economic system. Heterosexual population is needed for population growth, whereas capitalism economic system is for economic growth. As for non-sustainable society, two traits would be homosexual population and socialism economics. The homosexual population makes for non-sustainable society because once everything is aged out, its gone. Therefore, socialism economics is non-sustainable because eventually the society will run out of money of......

Words: 388 - Pages: 2

Free Essay

Biology Essay

...Lee, Cynthia. “Walking fish reveal how our ancestors evolved onto land” Biology News Net Aug. 2014. http://www.biologynews.net/archives/2014/08/27/walking_fish_reveal_how_our_ancestors_evolved_onto_land.html This article was about how fish evolved onto land, which could have led to how our ancestors evolved onto land. About 400 million years ago, fish began exploring the land around them and soon, they evolved into tetrapods. Tetrapods are today’s reptiles, amphibians, birds, and mammals. A fish called Polypterus can breathe air, walk on land, and they look a lot similar to ancient fish that evolved the same way. For example, when the fish walked on land, they would place their fins close to their bodies and lift their heads. Soon, their skeleton changed to become more elongate to adapt with how the fish walked by supporting their head and neck. The scientists have hypothesized that the behavioural changes reflect what may have occurred when fossil fish first started walking. One of the main issues in this article was how the scientists were going to compare fish walking and our ancestors walking on land today. The main question the author was investigating was how fish walking on land could have led our ancestors in the same direction. The evidence that supports the findings is found in old fossils of fish. By examining the fossils, they can see that the fish adapted to their environment by adapting their skeletons to walk on land. Often, there was controversy about how......

Words: 492 - Pages: 2

Free Essay

Lesson 3 Essay Questions

...Lesson 3 Essay Questions: 1. Compare and contrast directional selection and disruptive selection and provide an example of each. Both directional and disruptive selection is a type of natural selection. Natural selection is the differential survival and/or reproduction of organisms as a function of their physical attributes. (phenotype) This results in evolution over many generations. Each mode of selection alters the mean or variance of a phenotypic trait in a population or species. These distributions can be represented in bell curves. Both selection processes can be influenced by human interaction. Directional Selection occurs when an extreme phenotype at one end of a population distribution is favored over all other phenotypes and over many generations it will lead to one distinct form. An example of directional selection is resistance to antibiotics. When an antibiotic is administered a few of the bacteria survive because they are genetically resistant. The surviving bacteria will pass on this phenotype (resistance) to the next generation. Over time the bacteria will be completely resistant to the initial antibiotic. Disruptive selection is an outcome of natural selection in which both extreme phenotypes at the end of a population distribution are favored over the average phenotype. This type of selection favors polymorphism, the occurrence of two different forms in a population of the same species. It can also lead to specification and form two......

Words: 1451 - Pages: 6

Premium Essay

A Lesson Before Dying Essay

..."A Lesson Before Dying" is a fantastic novel written by Ernest J. Gaines. Grant Wiggins, Jefferson, and Paul are three characters from the novel that benefited, embodied, and understood the most important lesson before dying. The most important lesson and message before dying was that each of us has been created by God with potential to be great, and to help others reach greatness. Grant Wiggins is a prime example of the most important lesson before dying. He attempted to teach Jefferson to be a man and not a "hog" as the public defender had called him during the trial. Jefferson's godmother "wants [Grant] to visit [Jefferson] and make him know-- prove to these white men-- that he's not a hog, that he's a man. (Gaines 31) Grant accepts the challenge firstly, to prove the white men that were betting against him wrong and show them that Jefferson can and will transform into a man for the sake of black people in the South. However, he also accepts the challenge in order for Jefferson to be someone he (Grant) in the future would look up to because he is the only person who has the power now to stand up to the white people in the South. Also, Grant Wiggins is trying to expose and introduce Jefferson's greatness by calling him a hero. Grant begins to explain to Jefferson the "'A hero is someone who does something for other people. He does something that other men don’t and can't do. He is different from other men. He is above other men. No matter who those other men are, the......

Words: 1107 - Pages: 5

MUSE - Concerto Milano - 12/07/2019 - 2 BIGLIETTI SETTORE secondo anello rosso | Community | Summer Dresses