In a given population, the proportion of males to females also called the sex ratio is usually expressed as the number of males per 10 females.
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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 1:1. In a given population, the proportion of males to females usually expressed as the number of males per 1000 females. Normally at a specific stage in life, especially at birth and a given stage between birth and death.