Mendelian inheritance (or Mendelian genetics or Mendelism) is a set of primary tenets relating to the transmission of hereditary characteristics from parent organisms to their children; it underlies much of genetics. They were initially derived from the work of Gregor Mendel published in 1865 and 1866 which was "re-discovered" in 1900, and were initially very controversial. When they were integrated with the chromosome theory of inheritance by Thomas Hunt Morgan in 1915, they became the core of classical genetics.
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(law of recombination): Two characters determined by two unlinked genes are recombined at random in gametic formation, so that they segregate independently of each other, each according to the first law. (Note that recombination here is not used to mean crossing-over in meiosis).