A male (♂) organism is the physiological sex which produces sperm, and in most mammals typically has a y chromosome. Each spermatozoon can fuse with a larger female gamete or ovum, in the process of fertilization. A male cannot reproduce sexually without access to at least one ovum from a female, but some organisms can reproduce both sexually and asexually. Most mammal and human males have a Y chromosome, which produces testosterone to develop male reproductive organs.
Not all species share a common sex-determination system. In most animals including humans, sex is determined genetically, but in some species it can be determined due to social, environmental or other factors.
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