female:male ratio in K-3 kids
Kimberly Anne Chapman
kchapman at paul.spu.edu
Mon Jan 15 02:02:22 EST 1996
On 11 Jan 1996, Jane Dorweiler wrote:
> Whether this phenomenon is widespread or not, the first thing that came to mind
> when I heard this was the fact that it was about 6 years ago or so that I
> started to hear theories on how to increase the likelihood of conceiving a child
> of a particular sex by controlling the frequency and/or timing of intercourse
> relative to ovulation. Perhaps there just happened to be many couples who were
> trying for a particular sex child based on these methods??
> Jane Dorweiler ** Regardless of what they say about the
> Department of Plant Biology ** cat, curiosity is a good thing. It's
> University of Minnesota ** what makes each and every one of us
> dorwe001 at maroon.tc.umn.edu ** a scientist!!
I'd like to have more faith in American couples and discount the
possibility of people trying for a child of a particular sex. That has
some very ugly ramifications. But I think Jane Dorweiler is definitely
onto something regarding the frequency and time of intercourse. We are
all aware of the significant changes in a woman's body throughout the
menstrual cycle. In a genetics course I was reminded that one of these
changes was the fluctuation of the pH of the vagina. I was amazed to
hear that studies have been done showing that some spermatozoa have a
higher affinity and functioning capacity in a slightly more acidic
environment while others do better in a more basic environment.
Unfortunately I'm unable to recall which sperm cells are which, but I'll
be contacting the prof who taught the course. In light of this
information, I would hypothesize that the timing of intercourse in
conjunction with the current pH of the vagina is what influences which
sperm cells live to reach the ovum, therefore having a higher probability
to fertilize it.
I'd be very interested in feedback. Thanks in advance!!
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