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10 Questions

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Gene Flow and Genetic Drift

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Questions and Answers

What is the primary driver of changes in allele frequencies in a population?

Differences in fitness (correct)

Environmental changes

Mutations

Genetic drift

What is the outcome of directional selection in a population?

No change in genetic variation

Fixation of the deleterious allele

Decreased genetic variation (correct)

Increased genetic variation

What is the condition caused by defective alleles of the PAH gene in individuals who eat a normal diet?

Sickle cell anemia

Phenylketonuria (PKU) (correct)

Trisomy 21

Cystic fibrosis

What is the role of the environment in determining fitness?

It affects fitness by influencing the average fitness of different genotypes Signup and view all the answers

What is the result of removing phenylalanine from the diet of individuals with defective alleles of the PAH gene?

Almost no reduction in survival rate Signup and view all the answers

What is the outcome of genetic drift in a population?

Decreased genetic variation Signup and view all the answers

What is the term for the process by which one allele becomes more frequent in a population due to natural selection?

Directional selection Signup and view all the answers

What is the resource that provides information about trisomy 21 and other inherited diseases and conditions in humans?

Online Mendelian Inheritance in Man (OMIM) Signup and view all the answers

What is the result of the substitution of an advantageous allele for a deleterious one in a population?

Decreased genetic variation Signup and view all the answers

What is the term for the process by which populations become reproductively isolated and evolve into distinct species?

Species divergence Signup and view all the answers