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Meiosis – cont.

Meiosis – cont. Prophase 1. Spindle forms Nucleolus and nuclear membrane dissolve Tetrads form Crossing over may occur (tetrads get tangled and exchange equal parts). Metaphase 1 –tetrads line up in the middle. Anaphase 1 – tetrads are pulled apart.

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Meiosis – cont.

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  1. Meiosis – cont.

  2. Prophase 1 Spindle forms Nucleolus and nuclear membrane dissolve Tetrads form Crossing over may occur (tetrads get tangled and exchange equal parts)

  3. Metaphase 1 –tetrads line up in the middle Anaphase 1 – tetrads are pulled apart

  4. Telophase 1 - spindle dissolves - nuclear envelope and nucleolus reform - 2 haploid cells form The original and its duplicate from mom go to one daughter cell The original and its duplicate from dad go to the other daughter cell

  5. Prophase 2 – nuclear envelope and nucleolus dissolve, spindle forms Metaphase 2– choromosomes line up in the middle

  6. Anaphase 2 – chromosomes are pulled apart Telophase 2 – 4 haploid nuclei form

  7. Spermatogenesis -formation of sperm- 4 haploid cells grow flagella Oogenesis– formation of eggs - 4 haploid nuclei form, but only one gets cytoplasm and becomes an egg - the other 3 have no cytoplasm, are called polar bodies, and die

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