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Members of Hymenoptera, such as ants and bees, are determined by haplodiploidy, where most males are haploid and females and some sterile males are diploid.

The young of some species develop into one sex or the other depending on local environmental conditions, e.g.

Barring rare medical conditions, most female mammals, including female humans, have two X chromosomes.

Female characteristics vary between different species with some species containing more well defined female characteristics.

These abbreviations were contracted into the modern symbols.

The sex of a particular organism may be determined by a number of factors.Mammary glands are present in all mammals, although they are seldom used by the males of the species.Most mammalian females have two copies of the X chromosome as opposed to the male which carries only one X and one smaller Y chromosome (but some mammals, such as the platypus, have different combinations).many crocodilians' sex is influenced by the temperature of their eggs.Other species (such as the goby) can transform, as adults, from one sex to the other in response to local reproductive conditions (such as a brief shortage of males).The word female comes from the Latin femella, the diminutive form of femina, meaning "woman".

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