There was a German biologist called Walther (sometimes called Walter) Flemming (1843-1905). He was the founder of cytogenetics. But being a German, he cannot have been Sir Walter Flemming.
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Chromosomes
Guyana
Penicillin..used for bacteria infections...
Sir Walter Raleigh
Sir Walter Raleigh was the govenor of the lost colony of Roanoke.