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Which of the following can result from non-disjunction?

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Which of the following can result from non-disjunction?

(a) XY and XO

(b) YY and XY

(c) X and Y

(d) XY and XXY

I have been asked this question in exam.

My question is based upon Chromosomal Theory of Inheritance in division Chromosomal Basis of Inheritance of Cytogenetics

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Correct choice is (a) XY and XO

To explain: Non-disjunction in the male will produce XY and XO respectively. The other options are not suitable results of non-disjunction. In this case some part having XY will develop a male character with the parts with XO will have female characters.

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