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The Journal of Heredity 1982:73(2):123-127
© 1982 The American Genetic Association 73:123-127

research-article

Transgeneration analyses of the human sex ratio

The influence of combinations and permutations of sexes of children on family size

Elmer Gray

Western Kentucky University Bowling Green, KY 42101

Abstract

Transgeneration analyses, involving the parental, present, and projected generations, were made of the human sex ratio and the influence of combinations and permutations of sexes of children on family size in a population of Western Kentucky University students and their families. The investigation included some previously studied characteristics of the population. The general conformity of the results, previous and present, suggests a high degree of repeatability within the findings. Secondary sex ratios (males: 100 females) were 106.4. 101.2, and 133.3, respectively, for the parental, present, and projected generations. Corresponding average famiiy sizes were 4.73, 3.70, and 2.80 children. A higher percentage of one-child families consisted of a male rather than a female child, more two-child families included both sexes with the male being first-born, and more two-child families consisted of two males rather than two females. The two-child (male-female order) family occurred more frequently than any other family regardless of size, combination, or permutation of sexes.


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