Exam 20: Mechanisms of Evolution

Yeast cells are sequenced periodically to examine them for new mutations.The table shows the results. Is strain D accumulating mutations at roughly a linear rate? If yes, what is the rate? If no, is the accumulation faster or slower than linear?

Suppose variants at a single locus affect wing length in a species of crickets, with homozygotes for the L allele having long wings, homozygotes for the l allele having short wings, and heterozygotes having wings of intermediate length.In one population of 500 individuals, 340 have long wings, 120 have intermediate-length wings, and 40 have short wings.Under Hardy-Weinberg equilibrium, the expected number of individuals with long wings is _______.

In a population of 200 individuals at Hardy-Weinberg equilibrium, 72 are homozygous recessive for the character of eye color (cc).One hundred individuals from this population die from a fatal disease.Thirty-six of the survivors are homozygous recessive.In the original population, the frequency of the dominant allele was