QuestionAugust 15, 2025

What could be the reason for incomplete penetrance? a) The allele's penetrance is polygenic b) Epigenetic regulation c) Environmental modifiers d) All are correct

What could be the reason for incomplete penetrance? a) The allele's penetrance is polygenic b) Epigenetic regulation c) Environmental modifiers d) All are correct
What could be the reason for incomplete penetrance?
a) The allele's penetrance is polygenic
b) Epigenetic regulation
c) Environmental modifiers
d) All are correct

Solution
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Answer

d) All are correct Explanation 1. Identify factors affecting penetrance Incomplete penetrance can be influenced by multiple factors including genetic, epigenetic, and environmental elements. 2. Analyze each option a) Polygenic effects: Multiple genes can influence the expression of a trait. b) Epigenetic regulation: Modifications that do not change DNA sequence but affect gene expression. c) Environmental modifiers: External factors can impact gene expression. 3. Determine if all options are correct All listed factors (a, b, c) contribute to incomplete penetrance.

Explanation

1. Identify factors affecting penetrance<br /> Incomplete penetrance can be influenced by multiple factors including genetic, epigenetic, and environmental elements.<br /><br />2. Analyze each option<br /> a) Polygenic effects: Multiple genes can influence the expression of a trait.<br /> b) Epigenetic regulation: Modifications that do not change DNA sequence but affect gene expression.<br /> c) Environmental modifiers: External factors can impact gene expression.<br /><br />3. Determine if all options are correct<br /> All listed factors (a, b, c) contribute to incomplete penetrance.
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