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The probability of giving birth to a male or female child in humans is:
AAlways 100% determined by the mother's egg
BDetermined by environmental conditions
C75% male, 25% female
D50:50 (depending on whether the X- or Y-bearing sperm fertilises the egg)
Answer & Solution
Correct answer: D. 50:50 (depending on whether the X- or Y-bearing sperm fertilises the egg)
Father produces ~50% X-sperm and ~50% Y-sperm; mother produces only X-eggs. Sex of the baby is **50:50 chance**, **determined by the father's sperm** — not by the mother (despite social misconceptions).
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