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Is trisomy dominant o recessive

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Anonymous

14y ago
Updated: 8/17/2019

Its not a question of dominant or recessive, because Trisomy doesn't refer to a gene.

Trisomy is a chromosome disjunction, meaning that its a failure at the level of chromosomes. In most cases it is caused by a triple of the 21st chromosome (normal people just have it two times).

So in Meiosis this triplett wouldl be theoretically split: one in the first daughter cell and two in the second cell. (We ignore the low chance of another disjunction, were all three copies of the 21st chromosome get in one daughter cell and none in the other).

Mathematically the chance of passing trisomy on is roughly about 50%.

But most people with that trait aren't fertile.

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Wiki User

14y ago

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