A widow’s peak is dominant over a straight hairline. The genotypes of the offspring are WW, Ww, ww, and ww.

Widow’s peak is dominant, so offspring with at least one W allele (WW or Ww) have a widow’s peak. Two offspring are WW or Ww, and the two ww offspring have straight hairlines. Therefore, the result is 2 with widow’s peak and 2 with straight hairline: choice A.

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