Maternal inheritance patterns from generation to generation cannot be analyzed by simply studying the x chromosome in the way that paternal inheritance patterns can follow the y chromosome because

Option B, the X chromosome is obtained from both the father and the mother

Explanation:

Please see the attachment

Mitochondria produce atp, a high energy compound. atp is used for all sorts of enzyme-mediated reactions, such as making proteins/nucleotides/etc, certain compounds cross the cell membrane, muscles move, etc.  without this source of energy, a cell will die. it will not be able to repair itself, defend against pathogens, etc.