Exam 3: The Modern Synthesis

During a drought on Daphne Major, ground finches with thinner beaks would have been at an advantage over the birds that lacked this trait. However, because beak depth was favored by natural selection, beak width also increased. This is an example of how selection on one character can cause other characters to change in a ________ direction.

At the beginning of the twentieth century, geneticists

Although it would be advantageous for animals to be large enough to be invulnerable to predators, but agile enough to leap considerable distances, ________ make(s) this evolutionarily impossible.

An organism expresses fewer antipredator tactics when the number of predators in the environment is low. This is an example of

A correlated response to selection occurs when selection

Which of the following is correct?

Explain how natural selection can move a population beyond its initial range of variation.

How is continuous variation consistent with Mendelian inheritance?

An organism expresses antipredator tactics regardless of the number of predators in the environment. This is an example of

Genetic drift is strongest in

The character of "behavioral flexibility" evolved in the soapberry bug because it

Which of the following increase(s) genetic variation?

Some male soapberry bugs adjust their mate-guarding behavior in response to the local environment. Males guard females more when

Constraints on adaptation include

Imagine a population where 20 individuals are aa, 40 are Aa, and 40 are AA. What are the allelic frequencies?

Which of the following cannot cause evolutionary change within a population?

Phenylketonuria (PKU)

Imagine a population of 0 AA, 60 Aa, and 40 aa individuals. What is the frequency of each allele in this population?

Consider the following population: 30 AA individuals, 50 Aa individuals, and 20 aa individuals. Is this population in Hardy-Weinberg equilibrium? Explain your answer.

When a population reaches fixation,