Genes and Variation

All of the genetic information found in a population.

• population

• genetic drift

• evolution

• gene pool

Which of the following is an example of the founder effect?

• Humans choose two dogs they like the characteristics of and breed them together.

• Affected individuals with blue skin can trace their ancestry back to one of the first settlers in the region.

• The environment of a fox population changes and over time foxes who are white survive and pass on their genes to their offspring.

• Cheetah populations reach their lowest levels with reduced diversity and as they rebound are so genetically similar they appear to be inbred.

A change in the genetic composition of a population as a result of descending from a small number of colonizing individuals is called:

• founder effect
• bottleneck
• genetic drift
• gene flow

A change in relative allele frequencies of a population is called...

• artificial selection

• natural selection

• evolution

• fitness (the ability to be fit)

• variation

A change in a sequence of DNA is called a

• recombinationn

• polygenic trait

• single-gene trait

• mutation

The two main sources of genetic variation are

• genotypes and phenotypes.

• gene shuffling and mutations.

• single-gene traits and polygenic traits.

• directional selection and disruptive selection.

According to natural selection, dark colored tree trunks would favor

• light colored moths

• dark colored moths

• red colored moths

Genetic drift is change in the allele frequency of a population due to...

• random chance
• natural selection
• non-random mating (sexual selection)
• artificial selection

Which of the following is an example of the bottle neck effect?

• Bald Eagles are hunted until near extinction, population recovers.
• Small group of iguanas floats to an island, starts a new population.
• Red fox pups are more likely to survive in a snowy environment if they are born white.
• Farmer chooses seeds from largest apples to plant next year.  This results in larger apples from year to year.

Which of the following is an example of natural selection?

• Bald Eagles are hunted until near extinction, population recovers.

• Small group of iguanas floats to an island, starts a new population.

• Red fox pups are more likely to survive in a snowy environment if they are born white.

• Farmer chooses seeds from largest apples to plant next year. This results in larger apples from year to year.