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Sex xx fitter

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6. jul. - MeSH terms. Consanguinity*; Female; Fertility; Fetal Death; Heterozygote*; Humans; Inbreeding*; Male; Mortality; Pedigree; Physical Fitness; Pregnancy; Sex Chromosomes*; Sex Factors; Sex Ratio. Nature. Aug 31;() Why is the XX fitter? Evidence consistent with an effect of X-heterosis in the human female from sex ratio data in offspring of first cousin marriages. Hook EB, Schull WJ. PMID: ; [Indexed for MEDLINE]. MeSH terms. Consanguinity; Female; Heterozygote; Homozygote; Humans. Letter: Why is the XX fitter? Evidence consistent with an effect of X-heterosis in women from sex ratio data in offspring of first cousin marriages. Hook EB, et al. Nature. Show full citation.

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