Biology 5090 · O Level · Sexual reproduction in humans

Sexual reproduction in humans — practice question

Fig. 1.1 illustrates the stages in human twin development.
(a)[2]

On Fig. 1.1, label and name each of the following: • a gamete, • a zygote.

(b)[1]

Name the part of the female reproductive system into which structure P enters.

(c)[4]

If the sex chromosome in the sperm is a Y chromosome, and the one in the ovum (egg) is an X chromosome, state the sex of child A and of child B. Explain your answer. child A [BLANK] child B [BLANK] explanation [BLANK]

(d)[4]

Explain how a woman’s body stops any further ova (eggs) being released until the pregnancy ends.

Worked solution & mark scheme

This 11-mark question has a full step-by-step worked solution and mark scheme. One marking point: a gamete / egg / ovum / sperm that is correctly named and labelled

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