BIO 302 L7

Which of the following statements is true about population genetics?

• Most populations are genetically homogeneous.

• There is no variability in the genetic make-up of individuals.

• Genetic variability is necessary for adaptation to a changing environment.

• All genetic variability is expressed as phenotypic variability.

Fill in the blank: If there is no (or very limited) genetic variability, there is no ability to adapt ________ potential.

• A) evolutionary

• B) phenotypic

• C) genetic

• D) environmental

What is the term for the phenomenon where some traits are affected by multiple genes, and the effect of a gene can be modified by other genes?

• Mutation

• Pleiotropy

• Epistasis

• Phenotype

Fill in the blank: Alleles arise through ______, which is stochastic and not random.

• Selection

• Mutation

• Pleiotropy

• Epistasis

What is the Hardy-Weinberg equation used to predict allele frequencies?

In the Hardy-Weinberg equation, if the frequency of the recessive phenotype is f(aa)=0.25, what is the frequency of the dominant allele (p)?

• 0.25

• 0.5

• 0.75

• 1.0

Which type of selection acts against the extremes in a population?

• A) Directional selection

• B) Stabilizing selection

• C) Disruptive selection

• D) None of the above.

In _______ selection, individuals are selected against the mean.

• A) Stabilizing

• B) Directional

• C) Disruptive

• D) None of the above.

Which of the following statements is true about selection pressure?

• A) All traits are under selection pressure.

• B) Some phenotypic traits are neutral.

• C) Dominant traits cannot be lost if selected against.

• D) Recessive traits cannot hide in a population.

Fill in the blank: Not all traits are equitably heritable, some traits are influenced more by _______ than others.

• A) genetics

• B) environment

• C) selection

• D) mutation