Question

2. In wooly mammoths 50,000 years ago, the presence of a curled tusk allele (t) was recessive to a straight tusk allele (T). In Siberia populations, the frequency of the curled tusk allele was 0.85. Across the ice bridge in North America, the frequency of the curled tusk allele was 0.18. One thousand years later, the frequency of the curled tusk allele in the North America population was now 0.55. Of the wooly mammoths that currently reside in North America, what proportion of them must have migrated from Siberia to result in the increase in the curled tusk allele? (4 points)

3. Charles Xavier (a.k.a. Professor X) is researching mutants in the United States using his machine, Cerebro. There are many mutants with many different abilities, but every mutant power has a common epistatic “control” gene. The alleles for this gene are labeled “C” and “c”. If an individual has a gene that codes for a certain ability, that ability will not express itself unless the control gene has two recessive alleles. Knowing this, Professor X wants to track this control gene, and evaluate its mutation rate throughout the American population. Note that a mutation from C to c is a forward mutation and from c to C is a reverse mutation. Of the 318,000,000 people tracked through Cerebro, 11,943 experienced forward mutations and 25,937 experienced reverse mutations. What are the forward and reverse mutation rates? What are the C and c allele frequencies, assuming this population is in equilibrium? Are mutants on the rise or decline in the U.S. population? (5 points)

Answer 1

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