Cool, thanks.
I did a quick look and found this article:
Can the Shettles Method Help You Choose a Girl or Boy?
The first link I found was:
Characteristics of natural conceptual c... [Int J Fertil. 1992 Jul-Aug] - PubMed - NCBI
which states:
Trends in Population Sex Ratios May be Explained by Changes in the Frequencies of Polymorphic Alleles of a Sex Ratio Gene - Springer
which states:
I did a quick look and found this article:
Can the Shettles Method Help You Choose a Girl or Boy?
The first link I found was:
Characteristics of natural conceptual c... [Int J Fertil. 1992 Jul-Aug] - PubMed - NCBI
which states:
That was a little tangential though, since I was talking about genetic predisposition. I did find this link:article_sl said:The birth sex ratio favored males when intercourse preceded ovulation/fertilization by two days or longer. While this association was statistically significant, the number of pregnancies involved is too small to conclude that the relationship is real
Trends in Population Sex Ratios May be Explained by Changes in the Frequencies of Polymorphic Alleles of a Sex Ratio Gene - Springer
which states:
Like I said I never looked into that. We were more focused on getting pregnant than what gender the baby was.article_sl said:A test for heritability of the sex ratio in human genealogical data is reported here, with the finding that there is significant heritability of the parental sex ratio by male, but not female offspring