Sex composition

The sex composition of existing children has been shown to influence childbearing decision-making and behaviors of women and couples. One aspect of this influence is the preference for sons. In India, where son preference is deeply entrenched, research has normally focused on rural areas using cross-sectional data. However, urban areas in India are rapidly changing, with profound implications for childbearing patterns. Yet, evidence on the effect of the sex composition of current children on subsequent childbearing intentions and behavior in urban areas is scant.
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29.07.2020
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Sex Composition of Lamprey Populations

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Sex Composition of Lamprey Populations | Nature

The present paper deals with changes over time in the sex composition of a given population. Such changes are generated by the components of population change: natality, mortality, immigration and emigration. The objective of this paper is to propose a model which provides a quantitative statement concerning the effect of each such component on the change in the sex composition of the population. It is shown that the model is applicable to the measurement of sex composition by either the masculinity proportion or the sex ratio. To demonstrate the application of the proposed model, an example based on Canadian data is given. This is a preview of subscription content, access via your institution.
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Measuring Change in Sex Composition

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The sex ratio is the ratio of males to females in a population. In most sexually reproducing species, the ratio tends to be This tendency is explained by Fisher's principle.

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