Help me with Genetics :)?

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1. There is a small village in a mountain valley in Spain where a large number of people are polydactyl. Explain what this trait is. Explain why this trait tends to be passed on from generation to generation.

2. There have been cases in history where a king divorced his queen because she produced only daughters. Using your knowledge of genetics, explain why this was an incorrect move
 
1.Polydactyl is when an affected individual has additional fingers and/or toes. This trait is passed on from generation to generation because it is caused by a dominant allele. This means the trait will appear in both the homozygote for the trait and in a heterozygote. However, this trait has incomplete penetrance so it may not show up in every heterozygote individual.

2. A male is XY and a female is XX so it is actually the king's fault if a male is not produced because a female can only contribute an X chromosome.
 
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