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do some men produce more x sperm,some more y sperm and some 50% x 50% more chance of certain sex?

(13 Posts)
racheael76 Mon 22-Apr-13 18:33:32

do all men produce 50/50 of each sperm giving chance of girl or boy (mixed family) and
do some men produce more x sperm lets say 79% x 21% y giving higher chance of a girl and

do some men produce more y sperm more chance of boys.
is this why some have male dominate families or girl dominate families? do you think all mens sperm is 50/50 or varies?

sherazade Mon 22-Apr-13 18:34:38

WTAF has this got to do with AIBU?

lottieandmia Mon 22-Apr-13 18:36:40

I always thought the conditions in a woman's uterus can sometimes favour male or female sperm, so not just down to the man?

Tiredmumno1 Mon 22-Apr-13 18:37:21

Blimey, I think I need to lay down now grin

racheael76 Mon 22-Apr-13 18:38:18

Its my theory i would love to know what people think am i being unreasonable thinking this theory or am i right what do you think ?

alienbanana Mon 22-Apr-13 18:39:11

This again?

No. Men's sperm are 50/50 due to how they are formed.

meditrina Mon 22-Apr-13 18:41:41

I don't get why thesis an AIBU either.

One of the bigger surveys (families in New York) showed no essential difference to that which you'd expect on the mathematical 50/50 model. The one exception was that families with 3 boys were 50% more likely to have another boy than you would expect (9%, not 6%) but the sample size wasn't big enough to know if this was significant. Nor am I aware of other data on this, and what it shows.

TWinklyLittleStar Mon 22-Apr-13 18:43:26

Sperm are produced from spermatocytes - stem cells - which have two full sets of chromosome including 1 X, 1 Y. These eventually divide into two sperms, each with one full set of chromosomes, and either the X or the Y. So no, they produce equal amounts of each.

AshokanFarewell Mon 22-Apr-13 18:43:56

Gametes (sperm/eggs) are produced by meiosis so both X and Y sperm will be produced in equal numbers at first. They may not all survive or have equal chances of fertilising an egg though.

OliviaMumsnet (MNHQ) Mon 22-Apr-13 18:49:55

Hi there
WE shall move this to conception for you

bigkidsdidit Mon 22-Apr-13 18:54:42

a healthy man may make 50:50, although I am not syre of that.

But I went to a lecture the other day where it was mentioned that men can be carriers of disease, or have a disease, which leads to one gender sperm being less viable than the other.

I might try to look it up if you're interested.

racheael76 Mon 22-Apr-13 19:08:38

bigkidsdidit very interesting answer thank you i would love to know more.x

racheael76 Mon 22-Apr-13 19:10:42

sorry i put this in wrong section thanks olivia for your help.x

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