Meiosis

Meiosis

Early prophase 1: The chromatin begins to condense following interphase.

Mid-prophase 1: Synapsis aligns homologs, and chromosomes condense further.

Late prophase 1 – prometaphase: The chromosomes continue to coil and shorten. Crossing over results in an exchange of genetic material. In prometaphase the nuclear envelope breaks down.

Metaphase 1: The homologous pairs line up on the equatorial (metaphase) plate.

Anaphase 1: The homologous chromosomes (each with two chromatids) move to opposite poles of the cell.

Telophase 1 : The chromosomes gather into nuclei, and the original cell divides.

Prophase 2: The chromosomes condense again, following a brief interphase (interkinesis)in which DNA does not replicate.

Metaphase 2: The centrosomes of the paired chromatids line up at the equatorial plates of each cell.

Anaphase 2: The chromatids finally separate, becoming chromosomes in their own right, and are pulled to opposite poles. Because of crossing over in prophase 1, each new cell will have a new genetic makeup.

Telophase 2: The chromosomes gather into nuclei, and the cells divide.

Products: Each of the 4 cells has a nucleaus with a haploid number of chromosomes.

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