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I gave my students this multiple choice question: In humans, a V-shaped hairline is dominant over a straight hairline. If one parent is homozygous for a V-shaped hairline ( HH ) while the other parent is homozygous for a straight hairline ( hh ), what is the probability that the offspring of these parents will have a straight hairline?

Only one answer is correct among these 4 choices:
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- 50%
- 75%
- 100%

Could you tell me which one is correct?

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