Biology / Bio 0969 · Atom · ~20 seconds
The Tetrad
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A tetrad is a pair of homologous chromosomes, four chromatids total, held together by chiasmata after crossing over in prophase I.
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Each of a cell's 23 homologous pairs forms one tetrad, so a human cell in prophase I holds 23 tetrads.
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A tetrad's four chromatids are not four separate chromosomes — separation is still divisions away.