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Definition of Nondisjunction

A daughter wi...

Question

A daughter will not normally be colourblind, unless her mother is _ and her father is __.

A

carrier, colourblind

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B

colourblind, normal

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C

colourblind, carrier

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D

carrier, carrier

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Solution

The correct option is A carrier, colourblind
Daughters inherit X chromosomes of father and mother respectively. Since, one X chromosome masks the effect of another X chromosome, a daughter will only be colourblind if her mother is a carrier or colourblind and her father is colourblind.

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