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Possible to test for x or y sperm?



 
 
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  #11  
Old August 21st 06, 03:23 PM posted to misc.kids.pregnancy
Tori M
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Posts: 296
Default Possible to test for x or y sperm?



I suggest consulting a genetics counselor. Genetics can cause skewed
sex ratio in offspring, but 3 of 3 children being female is not all
that unlikely. Does the mother's family run to females? Eg, several
generations in which all children are female or, if there are male
children too, the males are not healthy?


what would the mothers history of girls have anything to do with it? It is
the Male that determined the sex.

Tori


  #12  
Old August 21st 06, 03:46 PM posted to misc.kids.pregnancy
Anne Rogers
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Default Possible to test for x or y sperm?

I suggest consulting a genetics counselor. Genetics can cause skewed
sex ratio in offspring, but 3 of 3 children being female is not all
that unlikely. Does the mother's family run to females? Eg, several
generations in which all children are female or, if there are male
children too, the males are not healthy?


what would the mothers history of girls have anything to do with it? It
is the Male that determined the sex.

sure it could there is a delicate chemical balance all through the
reproductive organs which means only the best sperm get through, it could be
that the balance in one women is hostile to female sperm and another is
hostile to male sperm. Plus, once the embryo is created there is the whole
implantation to get through, one sex could be favoured. Then there is
carrying the pregnancy to term there may be reasons why some women miscarry
foetuses of one sex and not the other.

Cheers

Anne


  #13  
Old August 21st 06, 04:39 PM posted to misc.kids.pregnancy
Ericka Kammerer
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Posts: 2,293
Default Possible to test for x or y sperm?

Tori M wrote:

what would the mothers history of girls have anything to do with it? It is
the Male that determined the sex.


That's not quite true. While it is the sperm that
determines the sex, there is a complicated dance that goes
on to determine *which* sperm fertilizes the egg. The
woman's body plays a significant role in that.

Best wishes,
Ericka
  #15  
Old August 22nd 06, 01:25 AM posted to misc.kids.pregnancy
Pologirl
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Posts: 342
Default Possible to test for x or y sperm?


wrote:
The best way to get a
girl is to have sex 3-5 days before ovulation. To raise you chances of a
boy, have sex only 1-2 days before ovulattion, the closer, the better.


As my MW put it, to conceive a girl, "put your order in early".

Anyway, to answer someone else's question, the sperm contributes an X
or Y, which to a first approximation determines the sex of the child.
However, and this is a big however, some families do produce a very
skewed sex ratio in their children. When the skew is toward females,
this is evidence that the female line carries a lethal gene that when
expressed in a male embryo tends to cause death, sometimes before
implantation (hence no detectable pregnancy that cycle). Conversely,
when the skew is toward males, that is evidence of a lethal gene
carried in the male line.

Because the OP is concerned that there is a genetic reason for 3 of 3
children being female, the OP should look to the woman's family for
relevant information.

On the other hand, the OP is concerned that the man's sperm has a
skewed sex ratio, not 50/50. That is possible, and testable, but
perhaps expensive: one genetic test per sperm tested. How many sperm
should be tested to get a reproducible estimate of the sex ratio? 10?
100? More? How can the sex ratio be other than the clasical 50/50?
Easy! A gene somewhere in the man's genome could have a lethal effect
when in the presence of the man's Y chromosome alone (ie, in the
absence of the man's X chromosome).

A competent genetics counselor can help to work this out.

 




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