What determines the sex of an organism?<br /><br /><br />
the number of sex cells it produces<br /><br />
the kind of sex cells it produces<br /><br />
the kind of sex chromosomes it receives<br /><br />
the number of sex chromosomes it receives<br />
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In humans, the sex is determined by the kind of sex chromosomes it receives
In many species, sex determination is genetic: males and females have different alleles or even different genes that specify their sexual morphology.
In animals this is often accompanied by chromosomal differences, generally through combinations of XY, ZW, XO, ZO chromosomes.
In other cases, sex of a fetus is determined by environmental variables (such as temperature).
Some species such as various plants and fish do not have a fixed sex, and instead go through life cycles and change sex based on genetic cues during corresponding life stages of their type.
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