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Question

In meiosis I, a bivalent is an association of

A
Four chromatids and four centromeres.
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B
Two chromatids and two centromeres.
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C
Two chromatids and one centromere.
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D
Two chromatids and four centromeres
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E
Four chromatids and two centromeres.
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Solution

The correct option is E Four chromatids and two centromeres.
Term bivalent is used to denote a pair of homologous chromosome. Each chromosome of such a pair is made up of two chromatids joined together at the centromere. Thus, each bivalent is actually made up of total four chromatids and two centromeres.

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