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Explain with the help of a figure that f...

Explain with the help of a figure that father is responsible for the sex of a child.

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Sex of a child depends on what happens during fertilisation.
(i) If a sperm carrying X chromosome fertilises an ovum which carries X chromosome, then the child born will be a girl.
(ii) If a sperm carrying Y chromosome fertilises an ovum which carries X-chromosome, then the child born will be boy.
Thus, sperm (from father) determines the sex of the child.
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