In humans, the sex of a child is determined by
Athe age of the mother.
Bthe number of autosomes in the zygote.
Cthe father's sperm, which may carry X or Y.CORRECT
Dthe mother's egg, which may carry X or Y.
JUPEBBiologyGenetics
AI
Toaster Teacher
Why the answer is C, and why the others tempt you.
Females are XX and produce only X eggs; males are XY and produce X-bearing and Y-bearing sperm in equal numbers. Whichever sperm fertilises the egg decides the sex, so the chance of a boy or girl is 50% at each birth.
Want this in Pidgin, Yoruba, Igbo or Hausa? Sign up free →
Practice more Biology questions
JUPEB Biology has thousands more questions like this — with Worked answers on every one.