Student Question

Why do the chromosomes in the haploid cells that are produced by meiosis 1 look different from those produced by meiosis 2?

Expert Answers

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Meiosis is a reduction division of a diploid cell into four haploid cells. It occurs in two stages, meiosis I and II. In meiosis I, before a cell undergoes this stage, the original diploid chromosome number is replicated and this results in pairs of chromatids. Also, homologous pairs come together to form groups of four known as tetrads. After meiosis I, this cell divides into two daughter cells, and each cell will have the same number of chromosomes as the ovary or teste cell that began the process had; the diploid amount. At this point, the amount of chromosomes has not been reduced. However, these two cells undergo another round of cell division, and this time, the chromatids separate into chromosomes again and move to opposite poles, resulting in four haploid cells. Therefore, the cells at the end of meiosis II are haploid or contain half the chromosome number as the original ovary or teste cells that they arose from.

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