Question

Before prophase II begins, does the DNA in the cell duplicate itself?

Answer 1

Answer:

YesThe original parent cell is called diploidbecause it contains a complete set of homologous chromosome pairs. Each of the four daughter cells is haploid, meaning that each contains half of the original parent cell's chromosomes.

Answer 2

Before meiosis, a cell duplicates its DNA content. During meiosis, the diploid cell produces four haploid daughter cells. Meiosis occurs in two phases. Before prophase II, DNA does not duplicate again.  

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Through Meiosis, a diploid cell (2n) produces four haploid daughter cells (n).

After DNA replication there are two meiotic phases.

1. The first one is a reductive phase, in which homologous chromosomes separate.  
2. In the second phase, the cell suffers a new, not reductive division.

1.  In the first phase, Meiosis I:

• Prophase I: Chromosomes condensate and become visible. Occurs crossing-over between homologous chromosomes. Crossin-over makes the daughter cells to be genetically different from the original one.

• Metaphase I: Homologous chromosomes randomly align in the equatorial plane.  

• Anaphase I: In this phase occurs the division of homologous pairs. Each chromosome migrate to different poles.

• Telophase I: Chromosomes of homologous pairs are already in the corresponding poles, and the nuclear membrane forms again in each pole.

2.  In the second phase, Meiosis II:

• Prophase II: Chromosomes condensate again and become visible.

• Metaphase II: Chromosomes join the spindle apparatus and migrate to the equatorial plane, where they randomly line up. Sister chromatids are holden together until they reach the Anaphase.

• Anaphase II: Centromeres divide, chromatids get separated, and each of them goes forward an opposite cellular pole.

• Telophase II: Once in the poles, the chromosomes become lax again and nuclear membrane forms again.

Cytokinesis occurs.  

Before Prophase II there is no DNA duplication. The only duplication event occurs before Prophase I.

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