Question 1

When bird populations migrate and mix with populations that do not migrate this can cause

Accepted Answer

Gene flow occurs when individuals from different populations interbreed, leading to the exchange of genetic material.

Question 2

Darwin proposed that natural selection occurs in an environment by

Accepted Answer

Darwin's theory of natural selection suggests that individuals with heritable traits that are advantageous for survival and reproduction in a given environment are more likely to pass on these traits to the next generation.

Question 3

There are more than 30 blood group genes in humans, in addition to the ABO locus. If an additional set of previously unknown blood group genes were used to determine blood groups, this would effectively increase ________ in human populations.

Accepted Answer

The discovery of additional blood group genes would increase genetic variability, as it would introduce more genetic combinations and diversity within the population.

Question 4

Female cardinals select male mates in part based on their bright red color. What effect would this have on a cardinal population that was in Hardy-Weinberg equilibrium?

Accepted Answer

Female cardinals selecting mates based on bright red color introduces sexual selection, which disrupts Hardy-Weinberg equilibrium and increases the frequency of red alleles.

Question 5

Large ears is a rare trait in a mainland population of mice. A female mouse homozygous for very large ears sneaks onto a boat and arrives at an island that already contains mice. This mixing will lead to a population with a higher incidence of big ears than the mainland population because of

Accepted Answer

Gene flow occurs when individuals from one population migrate to another, introducing new alleles into the population. In this case, the female mouse with large ears introduces the allele for large ears to the island population, increasing the incidence of this trait.

Question 6

An island is on the migration route of sea birds. What best describes the way this will change Hardy-Weinberg equilibrium in non-migrating populations, if the migrating birds have very different allelic frequencies?

Accepted Answer

The answer of An island is on the migration route...

Question 7

The disease sickle-cell anemia is common in malaria-infested areas because individuals that are heterozygous for the gene (AS) have enhanced resistance to malaria over normal individuals (AA). Individuals with severe sickle-cell anemia (SS) usually die before reproduction. If this population moves to an area without malaria, what will happen to the allele frequency of the A allele over time?

Accepted Answer

In the absence of malaria, the selective advantage of the AS genotype is lost, and individuals with the AA genotype will have a higher fitness compared to those with the SS genotype. This will lead to an increase in the frequency of the A allele over time.

Question 8

A population of lizards lives in a rocky area next to a desert. Some lizards are light colored and blend into the sand, whereas others are dark and blend into the rocks. Over time, this lizard population is likely to

Accepted Answer

Disruptive selection favors individuals at both extremes of a trait, which can lead to the formation of two distinct groups within a population, potentially resulting in speciation over time.

Question 9

A selection experiment you are doing requires certain conditions in order for evolutionary change to occur. What conditions would cause this change?

Accepted Answer

The answer of A selection experiment you are doing requires...

Question 10

In the lab you show that guppies under different predatory conditions change in rapid evolution. In the field you wish to design an experiment that would generate data to support your observation. What experiment would best help you achieve your goal?

Accepted Answer

Transferring wild guppies into a predator-rich environment and observing them over time allows for the study of natural selection and rapid evolution in response to predation pressure, supporting the lab findings.

Question 11

In both field and lab studies of guppies, you observe a rapid evolutionary change in the physiological traits that help the animals avoid predation. This observation illustrates which main point?

Accepted Answer

The answer of In both field and lab studies of...

Question 12

You are studying a population of isolated mammals. There is a great deal of variation within the population for specific traits that strengthen survivorship in an ever-changing environment. This represents which type of selection?

Accepted Answer

The answer of You are studying a population of isolated...

Question 13

Hardy-Weinberg states out that original genotype proportions within a population remain constant across generations if certain assumptions were met. These assumptions include

Accepted Answer

The answer of Hardy-Weinberg states out that original genotype proportions...

Question 14

Mutations affect Hardy-Weinberg equilibrium by

Accepted Answer

Mutations introduce new alleles into a population, thereby altering allele frequencies and affecting Hardy-Weinberg equilibrium.

Quiz 17: Genes Within Populations