Two parents with widow's peak and short fingers have a child with a continuous hairline and long fingers.What are the genotypes of the two parents? (W = widow's peak; S = short fingers)
A)WWSS * wwss
B)wwss * WWSS
C)WWss * WWss
D)WwSs * WwSs
E)WwSs * wwss

Question

Quizplus · Accepted Answer

Based on the traits and their inheritance patterns, widow's peak is dominant and short fingers are recessive. Therefore, the parents with widow's peak and short fingers must be heterozygous for widow's peak (Ww) and homozygous recessive for short fingers (ss). The child with continuous hairline and long fingers must have inherited the dominant allele for both traits (WW and LL). Therefore, the genotypes of the parents are WwSs and the best choice is D, which matches this genotype combination for the parents.

Two Parents with Widow's Peak and Short Fingers Have a Child