Answers to Problem Set 8

Answers to Problem Set 8 - D. is again correct for the...

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Answers to Problem Set 8 1. Answer: A. A single low-level release With underdominance, there is an unstable equilibrium at intermediate frequencies for the two alleles. By making a single release that is large enough to ensure that the frequency of the genetically engineered allele is above that equilibrium, natural selection will then cause it to be fixed. 2. Answer: C and D A. is incorrect because an autosomal gene might trace its ancestry back to an individual in a lineage that does not include either Mitochondrial Eve or Y-Chromosome Adam. The example of genes inherited from Neandertal illustrates this. B. is incorrect for the same reason. C. is correct for the opposite reason.
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Unformatted text preview: D. is again correct for the opposite reason. Think Neandertal genes. Europeans inherited these genes from Neandertals, while Africans inherited them from ancestral Africans. The common ancestral copy from Neandertals and Africans existed in hominids that lived before the Neandertal-Homo sapiens split, which was long before Mitochondrial Eve or Y-Chromosome Adam. 3. Answer: B, C and D A. is incorrect because if it were true, the European copy would be similar to the African copy, and it is not. 4. Answer: A A formal ancestral-state reconstruction shows that nodes 1 and 2 are reconstructed as bipeda., which makes answers B, C, and D incorrect....
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