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

Question

A couple whose sons are color blind with AB blood group, identify the parents from the following: (A) Mother color blind with A blood group; and father normal with blood group B (B) Mother normal with blood group A, and Father color blind with blood group B (C) Mother color blind with blood group B, and Father normal with blood group B (D) Mother normal with blood group A, and Father color blind with blood group B.

Tardigrade Admin · Accepted Answer

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., (XCY) but female needs two recessive genes (XCXC) for the expression of color blindness. Mother will colorblind with A blood group and father normal with blood group B

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

Mother color blind with A blood group; and father normal with blood group B

Mother normal with blood group A, and Father color blind with blood group B

Mother color blind with blood group B, and Father normal with blood group B

Mother normal with blood group A, and Father color blind with blood group B.