junk DNA
segments of DNA that have no apparent genetic function.
Origin of junk DNA
1990–95
British Dictionary definitions for junk dna
junk DNA
noun
DNA that consists of repeated sequences of nucleotide and has no apparent function
Scientific definitions for junk dna
junk DNA
[ jŭngk ]
DNA that serves no known biological purpose, such as coding for proteins or their regulation. Junk DNA makes up the vast majority of the DNA in the cells of most plants and animals, composing, for example, about 95 percent of the human genome.
Cultural definitions for junk dna
“junk” DNA
Segments of DNA along a chromosome that are not genes, do not code for anything that we know of, and whose purpose we do not understand. Approximately ninety-five percent of the human genome falls into this category. The term junk may be misleading, however, as this DNA may have other functions, such as regulating genes during development.
notes for “junk” DNA
Some scientists speculate that junk DNA may be archaic material left over from an earlier stage of evolutionary development.