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  4. A couple whose sons are color blind with AB blood group, identify the parents from the following:

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Q. A couple whose sons are color blind with AB blood group, identify the parents from the following:

EAMCETEAMCET 2003

Solution:

Color blindness is caused by recessive sex-linked gene carried by X chromosome. So, in male, one recessive gene is sufficient for its expression i.e., $ ({{X}^{C}}Y) $ but female needs two recessive genes $ ({{X}^{C}}{{X}^{C}}) $ for the expression of color blindness. Mother will colorblind with A blood group and father normal with blood group B

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