Which parent determines the sex of a human child, and what is the chance of a boy at each pregnancy?
Answer and explanation
Correct answer: C. The father
- Step 1: Females are XX and males are XY. Step 2. Every egg carries an X; half of the sperm carry X and half carry Y, so the father decides, with a chance of one half for a boy. Answer: the father, with a chance of one half. Why not the others: Eggs always carry X, sperm carry X or Y in equal numbers, and temperature does not decide sex in humans.
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