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A bivalent consists of

1. two chromatids and one centromere
2. two chromatids and two centromeres
3. four chromatids and two centromeres
4. four chromatids and four centromeres

Correct answer: four chromatids and two centromeres

Solution

A bivalent is formed when two homologous chromosomes pair up in prophase I of meiosis. Since each homolog has two sister chromatids and one centromere, the pair contains four chromatids and two centromeres.

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