Male

Male (♂) refers to the biological sex of an organism, or part of an organism, which produces small mobile gametes, called spermatozoa. 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. Not all species share a common sex-determination system. In most animals, sex is determined genetically, but in some species it can be determined due to social, environmental or other factors. The sex of humans is determined genetically. The existence of two sexes seems to have been selected independently across different evolutionary lineages (see Convergent Evolution). The repeated pattern is sexual reproduction in isogamous species with two or more mating types with gametes of identical form and behavior (but different at the molecular level) to anisogamous species with gametes of male and female types to...