Exam 21: Evidence and Mechanisms of Evolution

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?

Which of the following statements about allele frequencies is true?

When _______ selection operates, individuals at opposite extremes of a character distribution contribute more offspring to the next generation than do those that are close to the mean.

In order for a population to evolve,

A neutral allele

Which of the following conditions would be most conducive for the evolution of sexual reproduction and recombination?

Which of the following phenomena is not an evolutionary mechanism?

Natural selection works _______ on the genotype and _______ on the phenotype.

Natural selection acts on

The ultimate origin of genetic variation is

In a population of field mice in the Sand Hills of Nebraska, some individuals have lighter coat colors than others. Which of the following would be the most straightforward way to observe whether the lighter coat color is a heritable trait?

Allele frequencies for a gene locus are least likely to be significantly changed by

Subpopulations often vary genetically from one another because they

Which of the following statements about garter snakes that are resistant to TTD is true?

In pin flowers, the style is _______ and the stamens are _______.

Given the diversity of dog breeds that exists, which of the following principles is likely to be true?

The frequencies of different alleles at each locus and the frequencies of different genotypes in a population describe that population's _______.

Use the following to answer questions : The following data were collected in a study in which dark and light moths of the peppered moth (Biston betularia) were released and recaptured a few days later in several different areas (a, b, c, and d). -Based on these data, in which area is the light phenotype most advantageous? (Assume that recapture rates reflect the relative survival of the moths, not the ability of the investigators to find and recapture the moths.) What does this tell us about the fitness of light moths in this area?

Which of the following statements about the neurotoxin tetrodotoxin (TTD) is false?

Which of the following agents of evolution adapts populations to their environments?