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Principles Of Inheritance And Variation

Question
CBSEENBI12047663
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A colourblind mother and normal father would have

  • colourblind sons and normal/carrier daughters

  • colourblind sons and daughters

  • all colourblind

  • all normal

Solution

A.

colourblind sons and normal/carrier daughters

Colourblindness is a sex linked defect in which human beings are unable to distinguish red and green colour. The gene for colourblindness is located on X- chromosome.

Colourblind mother - XcXc

Normal father         -  XY

  Xc Xc
X XcX XcX
Y XcY XcY

They would have colourblind sons, i.e. XcY and carrier daughters, i.e. XcX.

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