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This stage is characterised by the appearance of recombination nodules, the sites at which crossing over occurs between non-sister chromatids of the homologous chromosomes.Analogously, a rise in prices of a country's exports will decrease that country's net exports and output and income.Can you think of the general formula for alkane family or homologous series? The general formula for alkanes is CnH2n+2, where n stands for number of carbon atoms and 2n+2 for number of hydrogen atoms in the molecule.Such paired chromosomes are called homologous chromosomes.These logos and certification help consumers get assured of quality while purchasing the goods and services.The homologous chromosomes separate, while sister chromatids remain associated at their centromeres.You have read during nomenclature of different homologous series in Unit 12 that alcohols are the hydroxy derivatives of alkanes.During this phase the chromosomes are fully condensed and the meiotic spindle is assembled to prepare the homologous chromosomes for separation.But the chemical properties, which are determined solely by the functional group, remain similar in a homologous series.Analogous to the physical systems chemical reactions also attain a state of equilibrium.The complex formed by a pair of synapsed homologous chromosomes is called a bivalent or a tetrad.The beginning of diplotene is recognised by the dissolution of the synaptonemal complex and the tendency of the recombined homologous chromosomes of the bivalents to separate from each other except at the sites of crossovers.In the first meiotic division the homologous chromosomes pair to form bivalents, and undergo crossing over.This is followed by anaphase I in which homologous chromosomes move to the opposite poles with both their chromatids.While buying many commodities, on the cover, you might have seen a logo with the letters ISI, Agmark or Hallmark.