why do genetic defects sometimes miss a generation or not affect other siblings!


Question:
I was reading an article about bi polar affective disorder yesterday.
Answers:
Because it is a recessive allele of a gene. It will only be expressed when paired with another recessive allele.

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Other Answers:
it's all random really. it could just happen, and thered be no way of stopping or knowing of it.
Answers:

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