Question

What are the chances of the occurrence of three consecutive boy children to a couple?
A. 1/8
B. 2/8
C. 2/6
D. 3/8

Answer 1

In humans, the gender of a child is only dependent upon the father of the child. The mother consists of only X chromosomes which are only available for the girl children. But the father has a fifty percent chance of X or Y chromosomes.

Complete answer: Having a boy or a girl is an independent event and does not depend on whether the previous event is the same or different. The probability of having a boy child in the first attempt is (1/2), as it is in the second and third attempts. Thus the total chance of occurrence of three consecutive boy children to a couple is 0.5 X 0.5 X 0.5 = 1/8.
The gender determination by the presence of chromosomes. The female consists of XX chromosomes whereas the male consists of XY chromosomes. During fertilization, one of the gametes from each parent comes and makes a cross to form a zygote. As a female consists of only XX chromosome so, only X chromosome will come whereas male consists of XY chromosomes, so there is fifty percent of coming X and fifty percent chance of Y chromosomes. If the sperm carries the X chromosome and fuses with the gamete of the female then there will be a girl child.
If the sperm carries the Y chromosome and fuses with the gamete of the female then there will be a boy child.
So, the correct option is option A

Note: The sex of a child is not related to another child of the same parent. Gender is independent and it is a matter of luck or chance. If the sex of the children of successive generation is the same, the probability of that outcome for a single-sex will increase.