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In page Ploidy:

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Ploidy can also vary between individuals of the same species or at different stages of the life cycle.[1][2] In some insects it differs by caste. In humans, only the gametes are haploid, but in many of the social insects, including ants, bees, and termites, males develop from unfertilized eggs, making them haploid for their entire lives, even as adults.[citation needed]