Biology
Grade-10
Easy
Question
Polydactyly in humans is an example of
Complete penetrance
Codominance
Incomplete penetrance
Genomic imprinting
Complete penetrance
Codominance
Incomplete penetrance
Genomic imprinting
Hint:
Incomplete penetrance
The correct answer is: Incomplete penetrance
A dominant allele produces polydactyly in humans but not all humans with the Allele display the extra digits.
In some cases, despite the presence of a dominant allele, a phenotype may not be present. One example of this is polydactyly in humans (extra fingers and/or toes). A dominant allele produces polydactyly in humans but not all humans with the allele display the extra digits. “Complete” penetrance means the gene or genes for a trait are expressed in all the population who have the genes. “Incomplete” or ‘reduced’ penetrance means the genetic trait is expressed in only part of the population.
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