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"The basis for modern day genetics was discovered in a 19th century Austrian monastery garden containing peas, and tended by a keenly observant monk named Gregor Mendel, who had training in mathematics and biology. Mendel cross-pollinated plants with 2 differing traits, a strain of homozygous wrinkled and yellow peas, with homozygous round and green peas, for two generations. The combinations of traits and their frequency appearing in each generation is shown and the causes in allele combinations explained."