Nondijunction in which parent produces turner syndrome in child
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Nondijunction in which parent produces turner syndrome in child

[From: ] [author: ] [Date: 11-10-18] [Hit: ]
Could you explain?I understand that the child inherited the recessive X- allele (which caused haemophilia) from the mother. Does it mean that nondisjunction occured in the mother?-no, since the father is not affected by haemophilia that means the lone X chromosome came from the mom.since father did not give any X to child,......
If neither parent has haemophilia and the child has X-linked haemophilia and turner syndrome, then the nondisjunction event in which parent caused the turner syndrome in the child? Also, is the nondisjunction in meiosis I or II ? Could you explain?
I understand that the child inherited the recessive X- allele (which caused haemophilia) from the mother. Does it mean that nondisjunction occured in the mother?

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no, since the father is not affected by haemophilia that means the lone X chromosome came from the mom.

since father did not give any X to child, that means, there was disjunction with the dad's meiosis.

Turner is an example of monosomy. So, it must have happened in meiosis 1, because if non-disjunction in meiosis 1, there will be no normal gametes produced after meiosis 2.

just for shetz and giggles, if there was nondisjunction in meiosis 2, then there would be 2 normal gamete, 1 gamete with 2 chromosomes, and 1 gamete with no chromosome. this does not cause monosomy.



Turner only affect females, so there is no sense of saying child. just say its the daughter

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yes, non-disjunction in meiosis 1 for the father. Think about it. You got your X and Y sex chromosomes. If there was non-disjunction, you will have the X and Y chromosomes in the same cell and the other cell with no X and Y. Then after meiosis 2, the sister chromatids of the mismatched in 2 gametes

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and the other 2 gametes will have no X or Y chromsome. There is no way in hell you can get a monosomy from this shet. Turner syndrome is a monosomy. So the daughter has mom's x. also, since the dad doesn't have hemophilia, the X cant be from the dad.

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I'm sorry, I meant , yeah, meiosis 1 is it..hehe, i'm getting confused

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I mean, if there is non disjunction in meiosis 1, then the half of your 4 gametes will be abnormal and the other half are nullisomy. Nullisomy offsprings usually die early in term and the the abnormal gametes can't cause monosomy. Turner is monosomy.

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