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Either of two divisions, male and female, into which most sexually reproducing organisms are grouped.

Sex is usually determined by anatomy, the makeup of the sex chromosomes, and the type and amount of hormones produced.

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In a species of slipper limpet (), a kind of mollusk, all individuals begin life as females.

For some fish, the number of males in the population determines the sex of the fish.

If there are not enough males, some females become males.

When the sex of an organism is determined by the sex chromosomes, males and females are generally produced in equal numbers.

In other organisms, such as bees and wasps, in which females develop from fertilized eggs and males develop from unfertilized eggs, distribution of the sexes is unequal.

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