Tue February 01, 2011 By: Apoorv Kumar

Explain that it is a matter of chance whether a couple will give birth to a boy or girl. (3 marks)

Expert Reply
Sun February 06, 2011
Dear student,
A male has XY whereas a female has XX sex chromosomes. Hence all eggs carry X chromosome whereas half the sperms carry X chromosome whereas the other half of sperms carry Y chromosome. So when the Y carrying sperm fuses with the egg, a boy is born whereas a girl child is formed when the sperm carrying X chromosome fuses with the egg. 
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