Question: A "widow's peak" hairline in humans is coded by the dominant allele W. A straight hairline is coded by the recessive allele w. A man with a homozygous dominant WW produces a zygote with a woman with a heterozygous dominant Ww for the trait. Which allele combinations could occur in the zygote?

  Options: 
 A. WW or ww
 B. WW or Ww
 C. WW only
 D. Ww only 
Answer: B