Sexual reproduction involves the two alternating processes of meiosis and fertilization. In meiosis, the chromosome number is reduced from the diploid to the haploid number. In fertilization, the nuclei of two gametes fuse, raising the chromosome number from haploid to diploid. Meiosis generates the haploid gametes, sperms and eggs, directly. These single cells fuse to form the zygote which will develop into another diploid animal. In most plants, meiosis and fertilization divide the life of the organism into two distinct phases or generations.
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