Meiosis I Prophase I Condensation of the chromosomes

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Presentation transcript:

Meiosis I Prophase I Condensation of the chromosomes Homologous chromosomes pair up Crossing-over takes place

Metaphase I, Anaphase I, Telophase I and Meiosis II Homologous pairs line up in the middle of the cell How one pair of homologous chromosomes lines up has no effect on how any other pair lines up. Anaphase I the chromosomes move to opposite sides of the cell. Telophase I Nuclear membrane appears. Meiosis II The 2nd division takes place producing haploid cells.

Normal Meiosis & Fertilization Meiosis allows the number of copies of each kind of chromosome to be reduced by half. (1n) Fertilization restores the chromosome count to the original number. (2n)

Crossing-over The chromatids tangle allowing genetic material to be exchanged.

Nondisjunction