Question

How is the sex of a child determined ??

Answer 1

Sex of child depends on which sex chromosome of male fuses with females xx sex chromosome.. As u know man has sex chromosome xy
So if the x chromosome of man fuses with females chromosome...... A girl child is born but if y chromosome fuses than a boy is born...
So sex of a child is dependent on father's chromosome and not of mother's....
Hope it helps....

Answer 2

The sex of a child
----------------------------------------------------

Each Human cell contain a nucleus which has 23 pairs of chromosomes. In human gamete cells 22 pairs of chromosomes are same in males and females , but the pair ( 23rd pair ) of chromosome is different and called sex chromosome and are responsible for sex in human.

• In males, the sex chromosomes are XY. one X chromosome and one Y chromosome.

• In females, the sex chromosomes are XX chromosomes.

Half of the father's gametes ( sperm ) carry X chromosomes and other Half carry Y chromosomes. All the mother's gametes carry only X chromosomes.

when a sperm fertilises an egg, the following is possible.

1) when a sperm carrying X chromosomes fertilises an egg , the child will be female ( XX ) .

2) when a sperm carrying Y chromosomes fertilises an egg, the child will be male ( XY ).

Thus, the sex of child depends on the type of sperm that fertilises an ovum ( or egg ).
It is clear from this , that the mother is never responsible for the sex of her child, the sex chromosomes of father ( XY ) are always responsible for the determination of the sex of a child ( Boy or girl ).

-----------------------------------------------------
-----------------------------------------------------
BEST OF LUCK ;-)

#akashmandal.