Heredity · Class 10 · CBSE Science
In humans, the biological mechanism of sex determination depends upon:
Practice question from Heredity (Class 10 · CBSE Science), with the correct answer and a step-by-step solution.
medium · MCQ · Q-A151BE
In humans, the biological mechanism of sex determination depends upon:
- A.The sex chromosome contributed by the mother's egg cell.
- B.The environmental temperature during embryonic development.
- C.The sex chromosome contributed by the father's sperm cell.Correct answer
- D.The total number of autosomes present in the zygote.
Solution
Human females have two X chromosomes (XX) and males have an X and a Y chromosome (XY). All eggs produced by the mother carry an X chromosome. Therefore, the sex of the child is determined by what the sperm carries: an X chromosome results in a girl (XX), while a Y chromosome results in a boy (XY).
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