A couple has five sons. What's the chance their next baby will be a daughter?

Question

From the biology standpoint. We're doing genetics and whatnot. I think that it's still 1/2... but not positive. Any help is appreciated.

Answer 1

It's 50/50 because when the DNA of a male seperates it can either be an X or a Y chromosome. The sperm that reaches the egg can either be X or Y.
If females have only XX cromosomes and males XY and half of a full cell goes to the egg or sperm, then for the female it would always be X and the male it can be X or Y.

Answer 2

Assuming that the chance of a couple having a daughter is 1/2 then, as far as statistics and biology homework is concerned, it doesn't matter what other children they have the chance that if they have a child it will be a daughter is still 1/2.

Answer 3

Mendelian Genetics would state that the answer is 1/2 = 50%.

for a girl: XX

for a boy: XY

Try placing the genes above in a Punnett Square to verify the answer. I tried to do this, via my computer, but the graphics appear strange :)

Answer 4

its a 50/50 chance but its said that men can influence the choice without even knowing it so i would say that pulls it down to a 45/55 chance of it being a girl

Answer 5

It's always a 50/50 chance, because there are only two options per conception, and any other prior conceptions have no bearing on the others.

Answer 6

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Answer 7

i think it's always a 50% chance- it doesn't matter what genders their previous children have been.

Answer 8

i think it is 50% chance they will have a girl.

Answer 9

you're right. it is always a fifty fifty chance.