<prompt> During meiosis, process of pairing of homologous chromosomes which permits large segments of DNA to be exchanged is known as:Crossing overNon-disjunctionAlignmentSynapsis  <response>: Synapsis pairing of homologous chromosomes is a unique event that occurs only during meiosis I in the production of gametes. Synapsis is necessary so that crossing over, whereby large segments of DNA are exchanged, can occur. Prophase-I of Meiosis I-Is long complex phase that differ considerably from mitotic prophase and is customarily divided into five sub- stages. 1.Leptotene: - Homologous chromosomes maternal and paternal copies of the same chromosomes begin to condense. 2. Zygotene: - Homologous chromosomes initiate pairing synapsis. The pairs of synapsed homologous are known as Bivalent. The sex chromosomes also sta to synapse during zygotene. 3.Pachytene: - Synapsis is complete for all chromosomes. Genetic recombination between non-sister chromatids is completed at this point, with sites where it has occurred, appearing as recombination nodules in the center of the synaptonemal complex. 4.Diplotene: - Pairs of homologous chromosomes separates except where crossing over has occurred chiasmata. This process is called disjunction. In the ovaries: - Primary oocyte gets arrested in diploteneby the fifth month is utero and each remains at this stage until the period before ovulation. up to 50 years 5.Diakinesis: -It is the prometaphase of the first meiotic division. 