This was the result of a non-disjunction event that occurred in meiosis I in the

Question

This was the result of a non-disjunction event that occurred in meiosis I in the father

This was the result of a non-disjunction event that occurred in meiosis II in the father.

This is the result of a non-disjunction event that occurred in meiosis I in the mother.

Events described in “a” OR “b” could have led to this karyotype.

Events described in “a” OR “b” OR “c” could have led to this karyotype.

2.

1 in 1 (100%)

1 in 4 (25%)

0%

1 in 2 (50%)

1 in 3 (33%)

This was the result of a non-disjunction event that occurred in meiosis I in the father

This was the result of a non-disjunction event that occurred in meiosis II in the father.

This is the result of a non-disjunction event that occurred in meiosis I in the mother.

Events described in “a” OR “b” could have led to this karyotype.

Events described in “a” OR “b” OR “c” could have led to this karyotype.

Explanation / Answer

Ans1. Although figure not given.

‘b’ is the correct answer. Non-disjunction in meiosis II leads to YY chromosome in the male. In Meiosis II, two cells will enter. One cell will have XX pair and other will have YY pair. If non-disjunction occurs in the cell having YY pair, in Meiosis II then the result will be one cell having YY pair and the other having 0 chromosomes.

** Without figure cannot do the second answer? Link not given!!

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