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In meiosis, DNA replication and the creation of a single-celled zygote is followed by two rounds of cell division to produce four daughter cells with half ... Read more the number of chromosomes as the original parent cell. The two meiotic divisions are known as meiosis I and meiosis II. Before meiosis begins, during S phase of the cell cycle, the DNA of each chromosome is replicated so that it consists of two identical sister chromatids attached at a centromere. In meiosis I, homologous chromosomes pair with each other and can exchange genetic material in a process called chromosomal crossover. The homologous chromosomes are then pulled apart into two new separate daughter cells, each containing half the number of chromosomes as the parent cell. At the end of meiosis I, sister chromatids remain attached and may differ from one another if crossing-over occurred. In meiosis II, the two cells produced during meiosis I divide again. During this division, sister chromatids detach from one another and are separated into four total daughter cells. These cells can mature into gametes, spores, pollen, and other reproductive cells.

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bDiplotene    double  Pachytene

bDiplotene double


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3  Pachytene  Greek for     Pachytene

3 Pachytene Greek for


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 a  Pachytene cell from  Pachytene

a Pachytene cell from


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at pachytene stage after  Pachytene

at pachytene stage after


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The triple stain CMA3DADAPI  Pachytene

The triple stain CMA3DADAPI


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at the pachytene stage of  Pachytene

at the pachytene stage of


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in a pachytene nucleus   Pachytene

in a pachytene nucleus


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Homologous pairing and the  Pachytene

Homologous pairing and the


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