= Sex ratio
The <sex ratio> is the relative abundance of sex classes in a specified <biological population> or life stage. It can be expressed as a ratio or as a fraction, so the convention and denominator must be stated. A birth <sex ratio> can differ from the adult or breeding <sex ratio> through unequal survival or participation in reproduction. This matters for <population genetics> because the number of successful breeders can differ from the total census size. <Biology 2e by Mary Ann Clark and others>[Section 45.1, Population Demography: population structure]{ref}
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