On Fri, 10 Sep 1999 [EMAIL PROTECTED] wrote:
> I was asked an interesting question in my Developmental Psychology class.
> When fraternal twins are conceived, do the two ova come from the same ovary
> or two different ovaries?
>
The answer is "yes", according to Guttmacher (1973), an old but
authoritative source. Unfortunately, it's not further documented, but
that's to be expected from a book intended for the layperson.
He states: "Perhaps in 5 to 10 per cent of cycles, two eggs are
ovulated, one from each ovary or both from the same one" (p. 30).
Reference
Guttmacher, A. (1973). Pregnancy, birth and family planning. Signet.
-Stephen
------------------------------------------------------------------------
Stephen Black, Ph.D. tel: (819) 822-9600 ext 2470
Department of Psychology fax: (819) 822-9661
Bishop's University e-mail: [EMAIL PROTECTED]
Lennoxville, QC
J1M 1Z7
Canada Department web page at http://www.ubishops.ca/ccc/div/soc/psy
------------------------------------------------------------------------
