Gametes of the mother (eggs) contain only X chromosomes while gametes of the father (sperms) contain 50% X and 50% Y chromosomes. So, the child will have one X chromosome from the mother and another X or a Y chromosome from the father. Offspring with XX chromosomes will be a girl and the offspring with XY chromosomes will be a boy.
Therefore, the sex chromosome of the father determines the sex of the child.
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Similar Questions
Q1
The sex of a child is determined by :
(a) the presence of an X chromosome in egg (or ovum).
(b) the presence of a Y chromosome in sperm.
(c) the age of father and mother.
(d) the length of the mother's pregnancy.
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Q2
When a sperm containing Y chromosome fertilizes an egg with X chromosome, the zygote develops into a .......... child.
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Q3
If the egg fuses with a Y chromosome-bearing sperm, the child produced is a female.
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Q4
Question 1 The belief that the mother is completely responsible for the sex of the child is wrong because the child
(a) Gets sex chromosome only from the mother. (b) Develops in the body of the mother. (c) Gets one sex chromosome from the mother and the other from the father (d) Gets sex chromosome only from the father
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Q5
What will be the sex of the child born :
(a) if X chromosome carrying sperm fuses with an egg cell carrying X chromosome ?
(b) if Y chromosome carrying sperm fertilises an ovum containing X chromosome ?