Non-sister chromatids “cross over” and exchange pieces of DNA with each other. Crossing Over – Occurs during meiosis I.This happens in metaphase In mitosis chromosomes line up alone. Pairing of homologous chromosomes – Meiosis I differs from mitosis because in meiosis I a pair of matching chromosomes, one from each parent, lines up at the equator.Spindle fibres begin to disappear, and a nuclear membrane forms around each set of chromosomes. Once they separate, each sister chromatid is considered to be a chromosome.ġ. Sister chromatids move to opposite pols of the cell. The X-shaped chromosomes form a single line across the middle of the cell.ġ. There is one chromosome of the homologous pair in each cell.ġ. One chromosome from each homologous pair is at each pole of the cell.ġ. ![]() Homologous chromosomes separate and are pulled to opposite poles by the spindle fibres.ġ. Homologous pairs line up along the equator of the cellġ. Homologous chromosomes (matching chromosomes from mother and father) pair up.ġ. Meiosis Click and Learn! Explore each stage in more detail! Stageġ.
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