Spindle microtubules extend from the centrioles and pull pairs of chromosomes apart and toward the poles.
Tetrads are pulled apart during meiosis I. This is a source of genetic diversity as the chromosome from either parent can be separated into either cell and genetic material exchange has already happened.
In meiosis II, sister chromatids are separated and moved towards each centriole, though the sister chromatids may not be homozygous anymore due to genetic material exchange.
In mitosis, sister chromatids are separated and pulled towards each centriole. Each centriole has one chromatid from the pair attached to it via microtubules. These chromatids are genetically identical because crossing over and genetic diversification does not occur in mitosis. Mitosis produces genetically identical daughter cells.
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