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tetrad

chromosome

Also known as: bivalent

Learn about this topic in these articles:

meiosis and chromosome role

In meiosis
Each pair of chromosomes—called a tetrad, or a bivalent—consists of four chromatids. At this point, the homologous chromosomes exchange genetic material by the process of crossing over (see linkage group). The homologous pairs line up along the midline of the cell in metaphase I and then separate in anaphase I,…
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