Exam 17: Evolution of Populations

In any given population the genotype frequency is usually the same as the allele frequency.

The genetic variation of a population is a result of differences in the _______ sequences of individuals and provides the raw material for evolution.

Antibiotic resistance in bacteria could be combated by all of the following methods, except

Larger male elephant seals have more mates than smaller male elephant seals because they are better at defending their territory (and mates). This is an example of __________ ___________.

Genetic drift has a greater effect on

A few members of a species establish themselves on a small island far from other populations of that species. They may experience a genetic bottleneck due to the _______ effect.

A gene has two alleles, D and d.The frequency of the D allele is 0.2. What is the frequency of the d allele? Show your work.

Which of the following factors is not likely to cause major changes in allele frequencies?

In your backyard, you step on a dandelion and one of its seeds gets trapped in the tread of your shoes. The next day, you go on a long hike in the wilderness wearing the same shoes. When you step in a mud puddle, the seed sticks in the mud. The seed grows into a dandelion, but no other dandelions are present to mate with it. This is an example of

In __________ selection individuals with one extreme of an inherited phenotypic trait have an advantage over other individuals in the population.

A gene has two alleles, B and b. If the b allele becomes "fixed" in the population, its frequency will be _______ percent.

In the Hardy-Weinberg equation, _______ represents the predicted frequency of the heterozygous genotype.

The human allele that causes six fingers per hand is dominant over the allele that produces five fingers per hand. Yet most humans have five fingers per hand. Why is this so?

Natural selection is a random process.

Mutations generally cause rapid changes in allele frequencies in populations.

In the figure below, the flying bird moves permanently into the population shown on land. As a result, the allele frequency of A changes from

A new allele spreads from one large population to another as a result of genetic flow.

If a given population has 30 RR individuals, 10 Rr individuals, and 10 rr individuals, what is the allele frequency of R?

Scientists have hypothesized that the reason European men have darker skin color than European women is that more than 10,000 years ago, these men preferred to mate with lighter-skinned females. If this is true, skin color is an example of ________ in Europeans.

Which of the following processes does not lead to an increase in recombination?