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Question

The sex of a child is determined by which of the following ?

(a) the length of the mother's pregnancy

(b) the length of time between ovulation and copulation

(c) the presence of an X chromosome in an ovum

(d) the presence of a Y chromosome in a sperm


Solution

(d) the presence of a Y chromosome in a sperm


A baby’s sex is determined at the time of conception. When the baby is conceived, a chromosome from the sperm cell, either X or Y, fuses with the X chromosome in the egg cell, determining whether the baby will be female (XX) or male (XY)To be female, one needs to be (XX), whereas to be a male, (XY) is needed. It is the Y chromosome that is essential for the development of the male reproductive organs, and with no Y chromosome, an embryo will develop into a female


Biology
Science for Tenth Class - Part III - Biology
Standard X

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