What Can Be Inferred About a Genetic Disorder That,when It

question 2

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 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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