This means there are 4 copies of each gene, present in 2 full sets of DNA, each set having 2 alleles. Remember, before meiosis starts the normally diploid DNA has been duplicated. The following are descriptions of the two divisions, and the various phases, or stages of each meiosis. In the next division, which immediately follows the first, the two alleles of each gene are separated into individual cells. In the first division, which consists of different phases, the duplicated DNA is separated into daughter cells. Meiosis then consists of two cell divisions, known as meiosis I and meiosis II. Phases of Meiosisīefore meiosis, the DNA is replicated, as in mitosis. Meiosis occurs in two distinct divisions, with different phases in each. However, if the organism cannot survive if they are polyploidy, meiosis must occur before reproduction. In other organisms, polyploidy is common and they can exist with many copies of the same gene.
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