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Exam 17: Genes Within Populations

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Question 1

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Darwin proposed that natural selection occurs in an environment by

A) favoring those individuals with the most favorable acquired characteristics.
B) producing a constant number of offspring while in that environment.
C) surviving for a fixed amount of time.
D) resisting the environment and keeping the environment from changing.
E) favoring heritable features that make the organism better suited to survive and reproduce.

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Question 2

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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?

A) It will go down because there is no malaria.
B) It will go down because there is no sickle cell anemia.
C) It will go up because there is no sickle cell anemia.
D) It will go up because there is no malaria.

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Question 3

Multiple Choice

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

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?

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?

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

Mutations affect Hardy-Weinberg equilibrium by

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

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?

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

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?

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?

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

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.