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Genetics is the branch of biology which deals with heredity and variation in living organisms. The modern science of genetics started with the work of Gregor Mendel in the mid-nineteenth century. He found that organisms inherit traits in a discrete way and the basic units of inheritance are now called genes.
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Natural History Museum: Triceratops
http://www.nhm.ac.uk/discover/dino-directory/triceratops.html