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sex ratio

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noun Sociology.
  1. the proportional distribution of the sexes in a population aggregate, expressed as the number of males per 100 females.
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Origin of sex ratio

First recorded in 1905–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for sex ratio

Historical Examples

  • A modification of the sex-ratio and of other ratios through linkage.

    Sex-linked Inheritance in Drosophila

    Thomas Hunt Morgan

  • The former are always normal in behavior, and the latter repeat in their descendants the 2:1 sex-ratio.

  • From an F2 culture that gave practically a 2:1 sex-ratio, vermilion females were bred to club males.

  • Two sex-linked lethal factors in Drosophila and their influence on the sex-ratio.

sex ratio in Medicine

sex ratio

n.
  1. The proportion of males to females in a given population, usually expressed as the number of males per 100 females at a specific stage in life, especially at conception, birth, and a given stage between birth and death.
  2. The ratio of the numbers of males to females affected by a particular disease or trait.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.