He also popularized the term junk DNA for segments of the DNA that have no known function .
He indicated that mammalian X chromosomes are conserved among species ; it has been referred to as Ohno 's law .
Ohno also popularized the term junk DNA for segments of the DNA that have no known function .
He indicated that mammalian X chromosomes are conserved among species ; it has been referred to as Ohno 's law .