Q. A bivalent of meiosis I consists of
Solution:
Solution:
During the pachytene stage of meiosis I, there is the formation of recombination nodules between homologous chromosomes, and hence each pair is called a bivalent. Chromosomes are paired and occur in synaptonemal complexes that are shortened. Each homolog of a pair is composed of two sister chromatids, and the pair itself is a tetrad of chromatids, i.e., four-stranded. Hence, the Bivalent and tetrad chromosome is a characteristic feature of the pachytene stage. Thus, the bivalent contains two centromeres and 4 chromatids. Recombination nodules appear on chromatids of non-homologous chromosomes, at which crossing-over takes place in the presence of recombinase enzyme.