A zygote which has an X-chromosome inherited from the father will develop into a girl.
Explanation: A female has two X chromosomes, while a male has one X and one Y chromosome. The sex of a child is determined by the sperm’s chromosome. If the sperm carries an X chromosome, the zygote will be female (XX). If the sperm carries a Y chromosome, the zygote will be male (XY).
Why other options are incorrect:
(a) boy:
A boy has the XY chromosome combination. If the zygote receives an X chromosome from the father, it will be a girl (XX).
(c) X- chromosome does not determine the sex of a child:
The X chromosome is one of the sex chromosomes, and it does determine the sex of a child. The combination of X chromosomes (XX) results in a female, while the combination of X and Y chromosomes (XY) results in a male.
(d) either boy or girl:
The sex of the child is determined by the combination of chromosomes received from the parents. If the zygote receives an X chromosome from the father, it will be a girl. If it receives a Y chromosome from the father, it will be a boy.