Question : How and where chiasma is formed? – InterviewSolution

InterviewSolution

1.	Question : How and where chiasma is formed?
Answer» Solution :After TETRAD formation, CROSSING over occurs in PACHYTENE stage. The non-sister chromatids of homologous pair make a contact at one or more points. These points of contact between non-sister chromatids of homologouschromosomes are CALLED chiasmata (singular-Chiasma). At chiasma, cross-shaped or X-shaped structure are formed, where breaking and rejoining of two chromatids occure. This results in reciprocal exchange of EQUAL and corresponding segments between them.

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