A two-generation study of human sex-ratio variation

J. W. Curtsinger, R. Ito, Y. Hiraizumi

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

We report here the first vertical population study of human sex-ratio variation. Sex-ratio data for 2 generations from Akita, Japan, have been analyzed. Parental age, birth order, sequences of the sexes at birth, and generations have no statistically significant effect on sex ratio. There is a slight excess of males at birth, as is typical for human sex-ratio studies. There is evidence of sex-ratio-dependent family planning. An analysis of vertical transmission of sex-ratio modifying factors that excludes effects of birth order in both the parental and offspring generations has detected a marginally significant paternal effect. Genetic variability of the sex ratio, if present at all, is of a very minor magnitude.

Original languageEnglish (US)
Pages (from-to)951-961
Number of pages11
JournalAmerican Journal of Human Genetics
Volume35
Issue number5
StatePublished - 1983

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