NEET Biology question
Which of the following is correct about bivalent? I. Bivalents are tetrads. II. A bivalent means 4 chromatids and 2 centromeres. III. One bivalent consists of 2 homologous chromosomes. IV. Bivalents form in zygotene.
Answer: (A)
Solution
A bivalent is formed by the synapsis (pairing) of two homologous chromosomes (III) during zygotene (IV). Since each of the two paired chromosomes has already replicated into two sister
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