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In a species of slipper limpet (Crepidula fornicata), a kind of mollusk, all individuals begin life as females.Clinging to rocks and to each other, they form piles. If another limpet attaches itself on top of the male limpet, the newcomer becomes male, and the male limpet beneath it reverts to being female.But this is not the whole story, and it applies universally only to mammals and birds.

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These slipper limpets show the evolutionarily advanced feature of internal fertilization, and the male on top extends his reproductive organ down the pile of females below him to fertilize their eggs.

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

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

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.

Our Living Language : Thanks to high school biology, we are accustomed to thinking of the sex of an organism as being determined by the chromosomes, notably the sex chromosome in humans (designated X or Y).

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