Morgan proposed that genetic exchange or recombination occurs in the region of

Chiasmata

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Linkage

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Centromere

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Telomere

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Solution

The correct option is D Chiasmata
Chiasma is a physical link, between two (non-sister) chromatids belonging to homologous chromosomes which remain in contact during the first metaphase of meiosis, and at which crossing over and exchange of genetic material occur between the strands.

So, the correct answer is 'Chiasmata'.

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