Practice_exam_3_Apr_20

Practice_exam_3_Apr_ - Homework 3 Practice Exam 3 Wednesday April 20 1 Explain what is meant by the following claims 1 Mutation proposes selection

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Homework 3 Practice Exam 3 Wednesday, April 20 1.) Explain what is meant by the following claims: 1. Mutation proposes; selection disposes. 2. Mutation is random, but evolution by natural selection is non-random. Key: Sample answer: 1. Mutation creates new alleles (or chromosomes, or types of chromosomes); selection is the primary reason that those alleles increase or decrease in the population. 2. The new alleles created by mutation have random changes in the DNA sequence, meaning that changes in the gene product are random with respect to Ftness. But under natural selection, only alleles that increase Ftness increase in frequency in a population. This is non-random. Grading rubric: ±or full credit (2 points), answer 1 must clearly articulate the concept that mutations make new alleles that are then acted on by natural selection. Answer 2 must clearly state the contrast between mutation creating any and every possible allele but selection favoring only certain alleles--a non-random subset. If one or two of or these concepts are missing or unclear or incorrect, award partial credit (1 point).
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This note was uploaded on 11/02/2011 for the course BIOL 11102 taught by Professor Parks,john during the Spring '11 term at University of Washington.

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Practice_exam_3_Apr_ - Homework 3 Practice Exam 3 Wednesday April 20 1 Explain what is meant by the following claims 1 Mutation proposes selection

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