Quiz.2.10.key-2 - drawn a diagram to help make this clear.]...

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BIO 325H, Spring 2010 Quiz 2 Name_________________________ You have 10 minutes to take this quiz. Read each problem carefully and make sure that you fully answer the questions asked. Good luck! 1. A. Why do the biological and recognition species concepts only work for sexually reproducing organisms? (1 pt) These species concepts define organisms as members of the same species if they share a common gene pool, that is, if they are successfully interbreeding with one another. Therefore these species concepts cannot be used to determine whether asexual organisms belong in the same species since they are, by definition, not interbreeding. 2. When we say that genes in two different species are paralogous what do we mean? (2 pt) When we say that genes in two different species are paralogous we mean that each gene is descended from different duplicate gene copies, which were produced by a gene duplication event that occurred before the speciation event. [You could have
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Unformatted text preview: drawn a diagram to help make this clear.] 3. A. If a population contains N individuals, and a new allele is produced due to a mutation, what is the initial frequency of that new allele? (1 pt). Since a diploid population of N individuals has a total of 2N alleles at a locus, and since a particular mutation is probably only going to occur on one chromosome in one individual during a generation, the mutated alleles initial frequency is most likely to be 1/2N. B. If the allele is neutral, why would genetic drift be more likely cause the new allele to be lost from the population? (1 pt) Remember the probability of an allele going to fixation is simply its frequency in the population. Since the unmutated alleles frequency (1 - 1/2N) is much higher than the mutated alleles frequency, the most likely outcome of drift will be loss of the mutated allele....
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