Mitochondria Within Human Cells Have Their Own DNA, but It

Multiple Choice

Mitochondria within human cells have their own DNA, but it is a relatively tiny genome encoding just thirteen proteins. Most of the genes required to make mitochondria are actually found in the nuclear genome of cells. What type of phenomenon is exemplified by this situation?

A) coevolution leading to degeneracy in one of the symbionts
B) genetic drift, which occurs naturally when selection pressures are relaxed
C) genetic recombination, which increases genetic variation
D) genetic selection, where the nucleus has greater fitness than mitochondria