A Common Hypothesis and Casual Assumption Is That Dogs Originated

A common hypothesis and casual assumption is that dogs originated from wolves.Because of the wide range of body sizes and shapes,other hypotheses include dog ancestry of jackals,coyotes,dingos or other wild dog species.In recent years,several studies have been done to clear up the lineage.One study tested the Y chromosome DNA that can only be passed down from male to male,and the other other study tested the mitochondrial DNA because _____.

A) the mitochondria perform cellular respiration, providing energy to speed up the DNA analysis.
B) the mitochondrial DNA is much smaller, easier and faster to analyze for the dog lineage.
C) the mitochondrial DNA is only passed down through females to each new generation.
D) the mitochondrial DNA records the inherited genetics of all the male and female parents of each generation.