Answer:
It will carry on as normal
Explanation:
In this case there is a mutation that only affects a single mitochondrion and not all of the mitochondria that are in the oocyte. The human body that houses mitochondria cells do not only maintain a single cell and so the energy requirements, which are of utmost importance is not dependent on the function of a single mitochondrion. In this case the cell will be able to meet it's normal quota for energy requirements and the offspring that can arise from the oocyte will not suffer from this specific short coming.