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(7 Posts)
racheael76 Mon 08-Apr-13 08:50:15

i have read men produce 50/50 of each x and y sperm.(50% girl and 50% boy).
just wondered if it is possible some men produce more girl sperm for example 76% girl and 24% boy sperm.
and some more boy sperm eg 67% boy 33%girl.or even 90% boy 10% girl!
and some 50% of each.
would this explain why some people have all children of the same sex as there chances are higher? and some families have generations of only producing either boys or girls.
your views please men produce exactly 50/50 of each?
please be nice.thank you.x

AMumInScotland Mon 08-Apr-13 09:52:18

I just posted this in your AIBU version, but I'll copy it here -

Toss a coin. It will come down heads or tails at 50:50.

Imagine heads=girl, tails=boy. Toss a coin 4 times, imagining a family of 4 children. Keep a note of the results.

Do it again. And again. Lots of times.

A lot of the time you will get 2 boys and 2 girls. Sometimes you will get 3:1 or 1:3. Less often (but it will still happen) you will get 4:0.

This is all you need to explain "why some people have all children of the same sex".
Feel free to repeat for families of only 2 children -1 in 4 of them will have two boys, 1 in 4 will have two girls, only 2 in 4 will have a mix

For 3 children -2 of 8 families will have all the same, 6 out of 8 will have a mix

It's really not rare for families to have all the same sex, without any need for an explanation beyond the ordinary randomness of life.

VenusRising Mon 08-Apr-13 09:56:31

Different sex sperm have different qualities though.
Male sperm Y can swim fast, and are more aggressive at the egg.
Female sperm X can survive longer, and are slower swimmers, but as they last longer they have a chance if the egg is still unfertilised by the male sperm.

The semen otoh has very variable qualities, some men produce sperm which is acidic, and the woman's body reacts to it. Some men produce semen which is very viscous and the sperms don't swim properly.

There is no way to predict what gender baby you have, but if you want a particular gender baby then the timing if sex is important: sex hours after ovulation will favour the faster swimming Y sperm who meet the egg immediately: sex at roughly the time of ovulation will be more favourable to the X sperm who can survive longer, as they can hang around waiting for the egg to come down the tube, while the Y sperm die off.

For IVF etc, X sperms are heavier, and can sperm can be separated by centrifuge. Ethically, though this isn't done (afaik) in the uk.

No, it isn't done in the UK.

I asked about this at my IVF appointment and was told it worked out at roughly 50/50 despite the fact that it is suggested that IVF favours boys. I found this article an interesting read:

However as you can see it was 56% chance of having a boy so still leaning more 50/50.

mybelovedmonster Mon 08-Apr-13 10:59:24

You got the answer on your other thread confused

SweepTheHalls Wed 10-Apr-13 20:54:28

Genetically they have to make 50% of each. A man is chromosally XY, half his chromosomes go into each sperm, so each time sperm are made , 1 gets an X and 1 gets a Y.

The X chromosomes join with eggs ( which are all X) making XX which is a girl, and the Y chromosome sperm join with eggs to make XY, and a boy.

Make sense?

Beccadugs Wed 10-Apr-13 23:38:02

From what I vaguely remember of a module on genetics and reproduction I did at uni, sperm are 50/50, but we got into a discussion about this, and lots is to do with internal environs, timing of sex and morphology/jail ties of x and y sperms.

That might be why some families have more children of one gender, because of the way the parents do things, are reproductively etc. IYKWIM!!

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