List three significant differences between meiosis I and meiosis II.

Meiosis 1 starts with one cell, ends with two. Meiosis 2 starts with two cells, ends with four.
Meiosis 1 lines up with homologous pairs (Metaphase 1). Meiosis 2 lines up straight in a line with no pairs (Metaphase 2).
Meiosis 1 one goes from Diploid to Haploid. Meiosis 2 goes from Diploid to Diploid.

Answered by ConradDD | 2024-06-10

The three significant differences between **meiosis **I and meiosis II: **Chromosome **pairing and recombination , Number of chromosomes, and Recombination events.

**Chromosome **pairing and recombination :

Meiosis I: During prophase I of meiosis I, **homologous **chromosomes pair up and undergo genetic **recombination **(crossing over) where genetic material is exchanged between non-sister chromatids. This results in increased genetic diversity .
Meiosis II: **Chromosome **pairing and recombination do not occur in meiosis II. Instead, the goal of meiosis II is to separate the **sister chromatids **produced during meiosis I.

Number of chromosomes :

Meiosis I: At the start of meiosis I, the cell is **diploid **(2n), meaning it has a full set of chromosomes. **Homologous **pairs of chromosomes align and separate during **anaphase **I, resulting in two haploid cells with half the number of chromosomes (n) as the original cell .
Meiosis II: The cells resulting from **meiosis **I enter meiosis II. The number of chromosomes remains the same throughout meiosis II. Sister **chromatids **separate during anaphase II, resulting in the **production **of four haploid cells .

**Recombination **events:

Meiosis I: **Meiosis **I allows for recombination events between non-sister chromatids of homologous chromosomes . This crossing over increases genetic diversity and introduces new combinations of alleles .
Meiosis II: **Meiosis **II does not involve recombination events. Instead, the focus is on separating the **sister chromatids **that were produced during meiosis I, ensuring each resulting cell receives a complete set of chromosomes .
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Answered by hritviks993 | 2024-06-17

Meiosis I separates homologous chromosomes and produces two haploid cells, while meiosis II separates sister chromatids, resulting in four haploid cells. In meiosis I, homologous chromosomes align as pairs, and in meiosis II, they align individually. Overall, meiosis I reduces chromosome number, while meiosis II focuses on the segregation of chromatids.
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Answered by ConradDD | 2024-09-30