To complete both parts of the questions we can say that: meiosis is the type of cell division used to form the gamete cells, the process of meiosis produces four haploid cells that contain a single copy of each chromosome, being four cells with 23 chromosomes (structure carrying genetic information found inside the nucleus of a cell) each in the case of humans. About the second part of the question that is talking about mutations, the only statement that is not true is that all the mutations are harmful.