For species who do not reproduce asexually, mechanimss of sex determination are essential to the survival of species. In humans, the sex of an individual is determined by the presence of a Y chromosome. It is important to note that sex and gender are two different concepts. Sex is determined by biology while gender is a social construct. In other species, sex is determined through other mechanisms. The sex of fruit flies is determined by the ratio of sex chromosomes and autosomal chromosomes. Some species have their sex determined through temporal influences.
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