Human polydactyly traits (having extra fingers or toes) are caused by a dominant allele. In a screening, it was found that out of 42 individuals carrying an allele for polydactyly, only 38 of them exhibited polydactyly. Which of the following is the correct interpretation of this observation?

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Biology · Genetics

Verified Solution4 OptionsUpdated: October 2026👁️1 View

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The penetrance of polydactyly is estimated to be approximately 90%

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Answer 1

The penetrance of polydactyly is estimated to be approximately 90%

Answer 2

The expressivity of polydactyly is 90%

Answer 3

This is an example of variable expressivity

Answer 4

The polydactyly trait is showing complete penetrance

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