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 heterogeneous for a widow’s peak (ww) having an offspring without a widow’s peak? 25 percent 0 percent 50 percent 75 percent

Option A

Explanation:

It is given that allele for a widow’s peak (W) is completely dominance over the allele for a straight hairline (w).

Two heterogeneous parents are crossed with genotype (Ww)

Therefore following offspring are produced-

Ww * Ww

WW

Ww

Ww

ww

Thus, out of four only one offspring with genotype (ww) will be without a widow’s peak.

Thus, the probability of having an offspring without a widow’s peak

%

Thus, option A is correct

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".