A) zygotene
B) pachytene
C) diplotene
D) diakinesis
Correct Answer: B
Solution :
Synapsis is the pairing of homologous chromosomes during the zygotene stage of meiosis. Each pair is called bivalent. One of the pair comes from the male parent and one from the female parent. Each member of the pair is of the same length, their centromeres are in the same positions and they usually have the same number of genes arranged in the same order. After zygotene stage cell entered in pachytene stage in which the bivalents become spiralled, shortened and thickened. In diplotene stage, chiasma is formed, which indicates the completion of crossing over and beginning of separation of chromosomes. In diakinesis, chromosomes become more condensed, bivalents more evenly distributed in nucleus and migrate towards periphery. The nucleolus disappear and nuclear membrane is broken completely.
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