Biology
Grade-10
Easy
Question
Polydactyly is caused by a dominant allele in humans, although not all people with the trait have the extra digits. This is due to
Complete penetrance
Codominance
Incomplete penetrance
Genomic imprinting
Complete penetrance
Codominance
Incomplete penetrance
Genomic imprinting
Hint:
Incomplete penetrance
The correct answer is: Incomplete penetrance
An example of a trait that is incompletely penetrant is polydactyly, which is a dominant trait causing extra fingers and toes. In some cases, the dominant trait of polydactyly can skip generations due to incomplete penetrance and then reappear in future generations.
If polydactyly is caused by just a single gene that only affects the number of fingers or toes and nothing else, then it is typically a dominant trait. If you have one “polydactyly” copy of any of these genes you get extra fingers even when the other copy says to make five fingers.
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