HW #23 - AP Biology Period 4#22 Liem Nguyen...

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AP Biology Period – 4 #22 Liem Nguyen 12/12/09 Homework #23 ( 091218 ): Chapter 23 (due Friday 091218 ) Total points: 30 for Attempt on all questions Concept Map: 10 points Population Genetics 1. Explain the statement “It is the population, not the individual, that evolves.” Some traits become more common within the population, while others become less common Although individuals do evolve in their life times, the evolutionary impact of the evolution does not count unless it is the evolution of a population. 2. Explain how Mendel’s particulate hypothesis of inheritance provided much-needed support for Darwin’s theory of evolution by natural selection. Parents pass on that retain their identity in offspring Mendel and Darwin did not know each other’s ideas, but when geneticists put these ideas together, they realized that evolution occurred because as the parents evolved, their newly acquired traits were embedded in their genes and passed onto their offspring. 3. Distinguish between discrete and quantitative traits. Explain how Mendel’s laws of inheritance apply to quantitative traits. Discrete: either-or traits Quantitative traits: characteristics in a population that vary along a continuum Discrete traits are traits that are definitely one trait or another. Quantitative traits are traits that vary, including skin color or fur length on an animal. Although Mendel only worked with discrete traits, geneticists later on discovered that quantitative traits are influenced by multiple loci following Mendelian patterns of inheritance. 4. Explain what is meant by “the modern synthesis.” Modern synthesis: a comprehensive theory of evolution that integrated ideas from many other fields R. A. Fisher (statistician), J. B. S. Haldane (biologist), Theodosius Dobzhansky (geneticist), Sewall Wright (geneticist), Ernst Mayr (biogeographer), George Gaylord Simpson (paleontologist), and G. Ledyard Stebbins (botanist) Seven scientists whom are listed above developed modern synthesis. They demonstrated both Mendelian rules and the rules of natural selection in their findings, ultimately leading up to modern synthesis. 5. Define the terms population, species, and gene pool. Population: a localized group of individuals that are capable of interbreeding and
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producing fertile offspring Species: a group whose members possess similar anatomical characteristics and have the ability to interbreed Gene pool: the aggregate of genes in a population at any one time A population is a group of individuals that are capable of interbreeding and producing fertile offspring. A group whose members have similar anatomical characteristics as well as the ability to interbreed is called a species. A gene pool is the group of all of the genes in a population at any one time.
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