THE MEIOSIS

MEIOSIS I

• Purpose: 1.reduces the number of chromosomes in half.
• To make the daughter cells haploid.
• 2. It is during meiosis I that most of the genetic recombination occurs.

PROPHASE I

• DNA condensation occurs, the nuclear envelope and nucleoli disappear.
• Spindle starts forming, and tetrads become visible during prophase.

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METAPHASE I

• Tetrads line up at the equator. The spindle has completely formed.
• The genetic recombination occurs in this phase.

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ANAPHASE I

• Tetrads pull apart and chromosomes move towards the pole.
• The chromosomes have 2 chromatids.

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TELOPHASE I(CYTOKINESIS)

• Chromosomes with two chromatids decondense.
• A nuclear envelope reforms around them. Each nucleus is now haploid.

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MEIOSIS II

• Purpose: At the end of meiosis I, each chromosome still had two chromatids.
• That is double the amount of DNA that a cell should have.
• Split the chromosomes so that each daughter cell has only one chromatid per chromosome.
• Which will make it a normal genetic content.

PROPHASE II

• Chromosomes with two chromatids become visible as they condense.
• The nuclear envelope and nucleoli disappear, and the spindle is forming.

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METAPHASE II

• Chromosomes with two chromatids line up at the equator.
• The spindle is fully formed.

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