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The majority of butterflies and moths also have a ZW sex-determination system. Flowers are usually hermaphroditic, producing both male and female gametes. In both XY and ZW sex determination systems, the sex chromosome carrying the critical factors is often significantly smaller, carrying little more than the genes necessary for triggering the development of a given sex. Testosterone is responsible for the development of male characteristics, including muscle mass and strength, fat distribution, bone mass, facial hair growth, voice change, and sex drive. It contains the testicles also called testes , as well as many nerves and blood vessels.


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