Yes, of course all my calculations are under the simplifying assumption of a single gene. But under that assumption, sisters of gay men have only 1/2 chance of having the gene and so their expected additional number of babies is only 1/6. If you don't think that this assumption is appropriate, you can suggest some other model and do a calculation. One thing I can guarantee you is that it won't produce the number 1/3.
If you don't think that this assumption is appropriate, you can suggest some other model and do a calculation. One thing I can guarantee you is that it won't produce the number 1/3.
I think you're missing the point. The effect size of the gene or genes is irrelevant, as is the architecture. There can be any distribution as long as there's enough to be consistent with current genetic research on homosexuality having turned up few or no hits (linkage, 23andMe's GWAS & GCTA, etc). The important question is merely: do their sisters have enough kids to vi...
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