Some of your DNA may not code for any protein and has no known function in gene regulation; it is sometimes referred to as "junk" DNA. How do nucleotide sequences of "junk DNA" evolve?
A)They evolve through natural selection.
B)They evolve through genetic drift and other chance processes.
C)They evolve to be more useful by taking on new functions.
D)They evolve by gradually being eliminated from the gene pool.

Question

Quizplus · Accepted Answer

Non-coding or "junk" DNA is subject to genetic drift and other chance processes since it does not directly influence an organism's phenotype. Over time, it may accumulate mutations that have either no effect or deleterious effects on the organism, leading to either neutral or negative selection pressure. However, it is also possible for non-coding DNA to eventually acquire new functions through processes such as gene duplication and exon shuffling.

Some of Your DNA May Not Code for Any Protein