What Can Be Inferred About a Genetic Disorder That, When

question 33

Multiple Choice

What can be inferred about a genetic disorder that, when it occurs in monozygotic twins, affects one twin 80% of the time and affects both twins only 20% of the time?

• A)Expression of homologous genes is influenced by the gender of the parent who contributed them.
• B)Nongenetic factors can influence the expression of identical alleles.
• C)The mutation occurred in a somatic cell rather than a germ cell.
• D)Mutation repair is incompletely penetrant.

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Definitions:

Secondary Helpers

Individuals that assist in the care and raising of offspring that are not their own, typically observed in social animal species.

Breeders

Individuals within a population that are of reproductive age and actively participate in mating and producing offspring.

Direct Benefits

Benefits that directly improve the fitness of an individual receiving them, often in the context of mate choice, including improved nutrition, protection, or resources.

Seychelles Warblers

A small bird species native to the Seychelles islands, known for its cooperative breeding behaviors.