Exam 15: Processes of Evolution

In a hypothetical population of sawflies,20 percent of the population is homozygous for allele A and 45 percent is homozygous for allele a.Assuming that A and a are the only alleles at this locus,what percent of the population is heterozygous?

The sizes of horns in males of a particular beetle have an interesting distribution: the highest frequencies are around 15 millimeters and 30 millimeters,with few individuals in between.Based on this observation,which evolutionary process is most likely to be operating on these horns?

Several populations of copepods are sampled for variation at the G locus.Population A is found to be 30 percent GG,60 percent Gg,and 10 percent gg.Population B is 62 percent GG,36 percent Gg,and 2 percent gg.Population C is 30 percent GG,40 percent Gg,and 30 percent gg.Which population shows a heterozygote deficiency?

Which statement about sexual selection is true?

According to the neutral theory of molecular evolution,

Migration of moths is most likely to lead to

Which statement about mutations is true?

Charles Darwin and _______ independently articulated the concept of natural selection.

A _______ mutation is one that neither increases nor decreases the fitness of its bearer.

Which is not a condition that must be met for a population to be at Hardy-Weinberg equilibrium?

In a hypothetical population of tree swallows,18 individuals are homozygous for the c4 allele,22 individuals are heterozygous for the allele,and 10 individuals lack the allele.What is the frequency of the c4 allele?

What is the maximum number of alleles that a given human adult (with 23 pairs of chromosomes)can have at any particular genetic locus?

Suppose that in a population of ruddy ducks,45 percent of individuals with the zeta-1 mutation survive from hatchling to the first year,while individuals without the mutation have a survival rate of 33 percent.This mutation does not affect any other component of fitness.We would call zeta-1 a(n)_______ mutation.

Suppose a biologist wanted to determine the mutation rate in a group of organisms by comparing the rates of evolution between closely related species.Which type of gene or part of a gene should the biologist examine?

Malte Andersson's study of widowbirds demonstrated that

Which condition would be most conducive to the evolution of sexual reproduction and recombination?

Three different alleles (b1,b2,and b3)at the b locus exist in a hypothetical population of juniper trees.If the frequency of b1 is 0.4,what can be said about the frequency of b3?

Use the following to answer questions : Suppose you have a population of flour beetles with 1,000 individuals.Normally the beetles are red;however,this population is polymorphic for a mutant autosomal body color,black,designated by bb.Red is dominant to black,so BB and Bb genotypes are red.Assume the population is at Hardy-Weinberg equilibrium,with equal frequencies of the two alleles. -What would be the expected frequencies of the red and black phenotypes?

Which mode of selection is most likely to lead to an increase in phenotypic variation?

According to the neutral theory of molecular evolution,the fastest rate of fixation of neutral mutations by genetic drift should occur in which population?