2. Full-sized wings are the typical phenotype for Drosophila. Which of the following events most likely led to the existence of the short-wing allele in Drosophila?
A. a change in the shape of a chromosome
B. a change in the DNA sequence of a gene
C. the insertion of a DNA strand during mitosis
D. the deletion of a chromosome during meiosis

Hope the answer is b

Mitochondria is the cell organelle that produced the energy that is needed in the body system in form of atp, that is why it is called the power house of the cell. energy is needed by the living organisms to carry out the activities which sustain life.  if the mitochondria is destroyed atp will not be produced. if the mitochondria is destroyed, energy production will stop and the affected living organism will not have the energy to carry out the necessary life processes; this will lead to the death of the organism.