Question

What is difference between meiosis 1 and meiosis 2?

Answer 1

In meiosis I, homologous chromosomes separate, while in meiosis II, sister chromatids separate. Meiosis II produces 4 haploid daughter cells, whereas Meiosis I produces 2 diploid daughter cells. Genetic recombination (crossing over) only occurs in meiosis I.

Answer 2

Crossing over or recombination of genetic material between chromosome pairs occurs during meiosis I, but not during meiosis II.

Meiosis I:

• Meiosis 1 is the first stage of meiosis, in which one parent cell divides into two daughter cells.
• This is the stage at which homologous pairs of chromosomes segregate and separate from each other, resulting in the division of the total chromosomal number by half.
• Meiosis I is the first round of cell division in which homologous pairs are separated.
• The cell is diploid during meiosis I because the homologous chromosomes are still located within the same cell membrane.
• The cells are considered haploid only after the first cytokinesis when the daughter cells of meiosis I have fully separated.

Meiosis II:

• Sister chromatids within the two daughter cells separate during meiosis II, resulting in the formation of four new haploid gametes.
• Meiosis II mechanics are similar to mitosis, with the exception that each dividing cell has only one set of homologous chromosomes.
• Meiosis II is a simple division, similar to mitosis, that does not involve crossing over or a reduction in the number of chromosomes.
• Meiosis II increases the number of daughter cells from two to four.

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