Nettie Maria Stevens, US geneticist

Nettie Maria Stevens, US geneticist

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Caption: Nettie Maria Stevens (1861-1912), US geneticist, using a microscope in a laboratory. Stevens was the first to establish that the sex of an animal offspring was determined by the type of chromosome from the sperm transferred in the fertilisation of the egg. Her early death meant that her work was developed and expanded by others, notably the head of her laboratory at the California Institute of Technology, Thomas Hunt Morgan. Photographed in 1909.

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