A colorblind mother and a normal father give birth to a Klinefelter child with normal vision. Where do you think the non-disjunction has taken place?(a) 1^st meiotic division of mother(b) 2^nd meiotic division of the father(c) 2^nd meiotic division of mother(d) 1^st meiotic division of fatherI have been asked this question in unit test.My query is from Sex Linked Inheritance in chapter Chromosomes and Sex Determination of Cytogenetics

A colorblind mother and a normal father give birth to a Klinefelter ch

1.	A colorblind mother and a normal father give birth to a Klinefelter child with normal vision. Where do you think the non-disjunction has taken place?(a) 1^st meiotic division of mother(b) 2^nd meiotic division of the father(c) 2^nd meiotic division of mother(d) 1^st meiotic division of fatherI have been asked this question in unit test.My query is from Sex Linked Inheritance in chapter Chromosomes and Sex Determination of Cytogenetics
Answer» The correct option is (d) 1^st meiotic division of father For EXPLANATION I would say: The non DISJUNCTION must be in the male parent as the child was not COLOR blind. This is possible only if one X chromosome was normal which here came from father. ALSO as the disjunction produced XY and not two copies of same chromosome it must have been in 1^st division.

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