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Chiasms of homologous chromosomes

Explain the chiasms of homologous chromosomes view in prophase I?

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The Chiasms are intersections of two tracts in the form of X. Chiasms viewed in prophase I are chromosome arms crossing over similar arms of their homologous. However whenever chiasms are seen beneath the microscope chromatids is exchanging chromosomal segments with another chromatids of its homologous.

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