Nettie Stevens is credited with pioneering sex determination which she put its responsibility on males. The discovery remained a paradigm shift from the former ways of looking at human chromosomes.
In recognition of this ground breaking achievement of all ages, Google launched a Doodle showing the genius peering through a microscope at the XY chromosomes.
Stevens may not be a household name, but her contributions remain pivotal to the scientific community. Nattie Stevens found that male sperm carry XY chromosomes while the female egss carry Y chromosomes. In her study on Mealworms, she concluded that fertilization is only possible with male sperm.
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