Sex-Linked Inheritance Problem Set

Problem 09: Tracing the inheritance of the human X chromosome


Women have sex chromosomes of XX, and men have sex chromosomes of XY.

Which of a women's grandparents could not be the source of any of the genes on either of her X-chromosomes?

A. Mother's Father.

B. Father's Mother.

C. Mother's Mother.

D. Father's Father.

The father's father contributes only the Y chromosome to his sons, and subsequently to his grandsons.
E. Mother's Mother and Mother's Father.


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University of Arizona
Updated: July 15, 1999
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