The allele for a widow’s peak has complete dominance over the allele for a straight hairline (w). What is the probability of two parents heterozygous for a widow’s peak (Ww) having an offspring with a widow’s peak?
A. 0%
B. 25%
C. 50%
D. 75%

Question

The allele for a widow’s peak has complete dominance over the allele for a straight hairline (w). What is the probability of two parents heterozygous for a widow’s peak (Ww) having an offspring with a widow’s peak?
A.  0%
B.  25%
C.  50%
D.  75%

trancenova · Answer

It will help fit you first fill in a punnett square like this:

|dw:1331863569952:dw|

then count the heterozygous pairs (heterozygous individual is one with two different alles, eg. Tt)