Why is it important for the dna to double before mitosis

Because it preserves all of the information carrying features of a single DNA.

Its easier for living cells to make copies

no i don't feel that humans have oversubscribed some medications

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.