Nettie Stevens (1861 - 1912) Doodle
Google is honoring Nettie Stevens, the American female geneticist who was one of the first to describe the chromosomal basis of s*x. She came up with the XY s*x-determination system, mostly found in humans to classify gender.
Females have two of the same kind of s*x chromosome (XX) and are called the homogametic s*x. Males have two distinct s*x chromosomes (XY) and are called the heterogametic s*x.
Nettie Stevens Google Doodle, aka logo, has the XY replacing the Os in the Google logo. Nettie Stevens is showed looking through a microscope at the chromosomes with other genetic-based imagery around the logo.
Nettie Stevens was born today, 155 years ago, on July 7, 1861, in Cavendish, Vermont. She passed away at the age of 50 from cancer on May 4, 1912, in Baltimore, Maryland.
In her short life, she published about 40 papers and was a leading force on genetics.
Source: http://searchengineland.com/google-honors-nettie-stevens-geneticist-discovered-xy-chromosome-253483
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