A married couple has 10 children and they are all girls. Which of the following...

Biology

JAMB 1982

A married couple has 10 children and they are all girls. Which of the following is the CORRECT explanation?

A. The woman is incapable of producing male children
B. The man’s sperms are very weak
C. The man is not athletic enough
D. The Y component of the men’s sex chromosomes was always involved
E. The X component of the man’s sex chromosomes was always involved

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Correct Answer: Option E

Explanation

The sperm carries either an X or Y chromosome, and the egg always carries an X. If the sperm carrying an X chromosome fertilizes the egg, the child will be XX, female. If the sperm carrying a Y chromosome fertilizes the egg, the child will be XY, male. Therefore there is most likely that the X component of the man’s sex chromosomes was always involved during the fertilization process.

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