Question Detail
Question
The sex of a child is usually determined by: A. Mother's phenotype B. father's phenotype C. chromosomal constitution of the sperm D. chromosomal constitution of the egg
Correct Answer
Option C is the correct answer.
Detailed Explanation
In humans, females are XX and produce eggs that always carry an X chromosome. Males are XY and produce sperm that carry either an X or a Y chromosome. The sex of the child is determined by whether the fertilizing sperm carries an X (resulting in XX female) or a Y (resulting in XY male).
Hint
It's the father's sperm that decides.