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Explanation of chiasms of homologous chromosomes

Give a brief explanation of the term “chiasms” of homologous chromosomes?

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Chiasms are intersections or cross-section of two tracts in the form of the X. The chiasms appeared in prophase I chromosome arms crossing over similar arms of their homologous. In verity if chiasms are seen under the electronic microscope chromatids are exchanging chromosomal segments or sequence with other chromatids of its homologous.

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