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that carry either the U chromosome and give rise to female gametophytes, or the V chromosome and give rise to male gametophytes.

Mating types

The mating type in microorganisms is analogous to sex in multi-cellular organisms, and is sometimes described using those terms, though they are not necessarily correlated with physical body structures. Some species have more than two mating types. Tetrahymena, a type of ciliate,

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