Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYCell Cycle and Cell Division1 Mark
MCQ
The complex formed by a pair of synapsed chromosomes is called as:
A
Kinetochore
✓
Bivalent
C
Axoneme
D
Equatorial plate
✓
Answer
Correct option: B.
Bivalent
Meiosis occurs in two stages, meiosis $I$ and meiosis $II.$Crossing over occurs during meiosis $I.$ Homologous chromosomes pair during meiosis $I,$ this is called as synapsis.
The synapsis occurs between homologous chromosomes and facilitates crossing over.
Each synapsed pair is comprised of two sister chromatids and hence is a bivalent.
Each chromosome of a bivalent, in turn, is made up of two sister chromatids.
Hence each pair is actually a tetrad of chromatids.
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