IMAT 2021 Q33 [Genetics]

Polydactyly is a condition caused by a gene mutation. Animals affected by polydactyly have extra digits on one or more limbs.

Five inheritance patterns of polydactyly in a species are shown in the diagrams.


Which inheritance pattern can ONLY occur when polydactyly is caused by an autosomal dominant allele and O when it is caused by an autosomal recessive allele?

[Assume normal cell divisions in all individuals.]

A 2

B 1

C 3

D 4

E 5

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