Question

A family has five girls and no son, the probability of the occurance of son in 6${}^{th}$ child is

• A. 1/2
• B. 1/5
• C. 1
• D. 1/4

Answer 1

The correct option is A 1/2

Human male has 44+XY chromosomes and human female has 44+XX chromosomes.
Parent generation : 44+XY x 44+XX

gametes 44+XY-----> 44+XX	23+X	23+Y
23+X	44+XX	44+XY
23+X	44+XX	44+XY

F${}_1$ generation = 1 girl : 1 boy. Hence, the probability of a child to be son is 1/2. Option A is the correct answer.