A couple has just had their fourth son The father can't understand why his wife can't produce a daughter Explain to the father why the problem is not with his wife?

Answer 1

The thing that controls how we look is our genes. Genes are passed from mother and father to son and daughter. This is why we look somewhat like our parents and siblings. There is a special gene known as the sex gene. This gene comes in to different forms, the X chromosome and the Y chromosome. If you have two X chromosomes you are a woman. If you have one Y and one X you are a man. So if a couple have a son then the Y chromosome MUST have come from the father(because the mother doesn't have one). When a child is conceived the father donates an X(50%) or a Y(50%), the mother donates an X(100%). I would like to point out that it is nobody's "fault" or "problem" it is a simple "roll of the dice". You are more or less likely to have a girl 50% of the time. The chance that a couple will have 4 boys in a row is therefore 6.25%. In other words out of 100 couples about 6 of them will have 4 boys in a row.