Susumu Ohno
In his book, he also suggested that vertebrate genome is the result of one or more entire genome duplications. Variations of this idea have come to be known as the 2R hypothesis (also called "Ohno's hypothesis"). He indicated that mammalian X chromosomes are conserved among species: it has been referred to as Ohno's law. He also invented the term Junk DNA for segments of the DNA that have no known function.