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Answer 3:
Now meiosis is tricky. Meiotic cells undergo a more complicated process to ensure the correct number of chromosomes. ... At first the cells have the same number of chromosomes as mitosis. DNA replication occurs, giving a total of 46 chromosomes(or 23 chromosome pairs) and 92 chromatids (or 46 chromatid pairs).

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The vast majority of cells in an organism's body are diploid; they contain two pairs of every chromosome. Chromosomes are the physical structures on which genes are located. However, for the purposes of sexual reproduction, haploid cells, which contain just one copy of each chromosome, are necessary. Otherwise, the offspring produced would have too many chromosomes and could never survive.

Meiosis I shuffles the genes on the parent chromosomes to help ensure genetic diversity, and then it separates each pair of chromosomes into two new daughter cells. Each of these chromosomes are composed of two chromatids, which, because of recombination, carry different combinations of the parent's genes. The purpose of meiosis II is to split each chromatid, producing four haploid cells. These four cells are called gametes.

As an example, humans carry 46 chromosomes in their nonreproductive cells. Meiosis I in humans produces two haploid cells with 23 chromosomes, or pairs of chromatids, and meiosis II splits those cells into four new cells, each carrying 23 chromatids. These gametes are better known as sperm cells and eggs cells in humans. When they fuse during sexual reproduction, they form a cell, called a zygote, which is diploid with 46 chromosomes once again. The shuffling of genes that occurs during meiosis and the mixing of parental genes during sexual reproduction help to ensure genetic diversity in a species.

Done by omar alaa and hudaifa

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Meiosis I is dedicated to forming two haploid cells from one diploid cell, while meiosis II is meant to split the sister chromatids in the haploid cells produced in meiosis I, creating four daughter cells. Meiosis I also recombines, or shuffles, genes on each pair of chromosomes.

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Meiosis I is dedicated to forming two haploid cells from one diploid cell, while meiosis II is meant to split the sister chromatids in the haploid cells produced in meiosis I, creating four daughter cells. Meiosis I also recombines, or shuffles, genes on each pair of chromosomes.