Question

In humans, polydactyly (i.e, presence of extra fingers and toes) is determined by a dominant autosomal allele $(P)$ and the normal condition is determined by a recessive allele $(p)$. Find out the possible genotypes of family members $1$, $2$ and $3$ in the given pedigree.

	$1$	$2$	$3$
(a)	$PP$	$Pp$	$pp$
(b)	$PP$	$PP$	$pp$
(c)	$Pp$	$PP$	$Pp$
(d)	$Pp$	$Pp$	$pp$

• A. a
• B. b
• C. c
• D. d

Answer 1

Answer: (D)

Given pedigree chart for polydactyly (autosomal dominant trait) can be explained as follows :