Edmund Beecher Wilson independently discovered the same mechanisms the same year, working with Hemiptera. The Y chromosome was identified as a sex-determining chromosome by Nettie Stevens at Bryn Mawr College in 1905 during a study of the mealworm Tenebrio molitor. The Y chromosome is passed only from male parents to male offspring. In mammals, the Y chromosome contains the SRY gene, which triggers development of male gonads. Along with the X chromosome, it is part of the XY sex-determination system, in which the Y is the sex-determining because it is the presence or absence of Y chromosome that determines the male or female sex of offspring produced in sexual reproduction. The Y chromosome is one of two sex chromosomes in therian mammals and other organisms.
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