Homologous chromosomes, each having sister chromatids that are joined/paired by a nucleoprotein lattice during meiosis, are called:
Correct answer: B. Bivalent
- A. Monovalent
- B. Bivalent
- C. Tetravalent
- D. Pentavalent
Explanation
The first essential phenomenon of meiosis i.e. pairing of homologous chromosomes called synapsis starts. This pairing is highly specific and exactly pointed but with no definite starting points. Each paired but not fused, complex structure is called bivalent or tetrad. Bivalent is formed during zygotene. Each bivalent is made up of four chromatids, two of each chromosome. The centromere is the part of a chromosome that attaches to the spindle during cell division. Each bivalent, thus, contains two centromeres.
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