The sex and sexual characteristics constitute key aspects of an organism’s life and are determined by a biological process known as sex determination. These ever-evolving mechanisms are broadly classified based on the type of “switch” that triggers them. Genetic sex determination is dependent on sex chromosomes, such as the X and Y chromosomes in human beings, whereas environmental sex determination depends on factors like temperature and the local ratio between males and females. Although most sex determination mechanisms are genetic or environmental, a third type of sex determination, which depends on completely random factors, also exists. This, however, has not been explored completely.
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Source: Phys.org