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9 votes
9 votes
A husband and wife have two sons. One boy has a straight thumb, while the other has a bent thumb. What causes this difference?

User Oltman
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2 Answers

1 vote
1 vote
The difference in genetics in both parents cause this.
User Tmhs
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3.2k points
4 votes
4 votes
Answer
The boys have different alleles
User Levar
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