Meiosis or reduction is a rather complicated type of cell division occurring in the reproduction of germ cells at the time of gamete formation. The process of meiosis occurs both in plants and animals.
In animals it occurs during gametes formation whereas in plants, it occurs during spores formation. It has already been stated that every species of animals and plant has a definite number of chromosomes and that this number remains constant in its somatic cells, generation after generation. To keep the number constant, the chromosome number in gametes is reduced to half. When male and female gametes and their nuclei fuse, the normal number of chromosomes characteristic of each species is restored. The somatic or vegetative cells having the complete number of chromosomes are called diploid (2n). While gametes containing half of the original number of chromosomes are called haploid (n) or monopoloid.
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