Sex is a biological phenomenon, while gender is a psychological phenomenon.
Sex is a biological concept. Asexual reproduction (cloning) is routine in microorganisms and some plants, but most vertebrates and all mammals have 2 distinct sexes.
Even single cell organisms have “mating types” to facilitate sexual reproduction. Only cells belonging to different mating types can fuse together to reproduce sexually.
Sexual reproduction allows for exchange of genetic information and promotes genetic diversity.
The classical biological definition of the 2 sexes is that females have ovaries and make larger female gametes (eggs), whereas males have testes and make smaller male gametes (sperm); the 2 gametes fertilize to form the zygote, which has the potential to become a new individual.
The advantage of this simple definition is first that it can be applied universally to any species of sexually reproducing organism.
Second, it is a bedrock concept of evolution, because selection of traits may differ in the 2 sexes.
Thirdly, the definition can be extended to the ovaries and testes, and in this way the categories female and male can be applied also to individuals who have gonads but do not make gametes.
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