What do you mean by synapsis and crossing over?
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Crossing over is an interchange or reciprocal exchange of segment between chromatids of a homologous pair of chromosomes resulting in a recombination of gene.The term crossing over was coined by Morgan 1990. Synapsis is the pairing of two homologous chromosomes that occur during meiosis.
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Synapsis (also called syndesis) is the pairing of two chromosomes that occurs during meiosis. ... Sex chromosomes also undergo synapsis; however, the synaptonemal protein complex that holds the homologous chromosomes together is only present at one end of each sex chromosome.
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