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Meiosis: Reduction Division Meiosis is a form of nuclear division that reduces the chromosome number by half. Therefore, when a sperm fertilizes an egg, the zygote will have the normal number of chromosomes for that species Before meiosis begins the parent cell is diploid (2n); it contains pairs of chromosomes called homologues. Consider the pair of homologues shown in Figure 9.2. A pair of homologues is called a tetrad because it contains two pairs of sister chromatids or four chromatids altogether. Following meiosis, the daughter cells are haploid (n): they contain only one from each pair of homologues Before proceeding a. Distinguish between diploid (2n) and haploid (n) XX Figure 9.2 Homologues A pair of homologues have the same shape and size. They forma totrad because each homologue has two chromatids b. Distinguish between a homologue and a tetrad:

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