World of Biology on Instagram: "Homologous chromosomes during crossing over Chromosomal crossing over is a biological process that occurs during meiosis, when pairs of homologous chromosomes (the same type of chromosome) align with each other. While aligned on the meiotic plate, they are held together by specialized structures. At specific points called chiasmata, the duplicated DNA strands break and rejoin with corresponding strands from the other homologous chromosome. This exchange means each