Amutation that will be passed from parent to offspring is a mutation that occurred during meiosis or mitosis?

I think  the answer you are looking for is mitosis I feel about 98% confident , best wishes and good luck :)

The answer is Meiosis because Mitosis is when the daughter cell is exactly the same as the parent and Meiosis creates 2 cells the same and are divided in half to create 4 different cells with half the number of chromosomes