Here's a problem to solve: 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?

Among the 4 following options, which is the correct answer?

- A: WW or ww
 
- B: WW or Ww
 
- C: WW only
 
- D: Ww only
 