Explain chiasms of homologous chromosomes, Biology

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Q. What are the "chiasms" of homologous chromosomes observe in prophase I?

Chiasms are intersections of two tracts in the form of X, The chiasms seen in prophase I are chromosome arms crossing over same arms of their homologous. Indeed when chiasms are seen under the microscope chromatids are exchanging chromosomal segments with other chromatids of its homologous.

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