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Which of the following pairing will not occur during meiosis of tetraploid?

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Which of the following pairing will not occur during meiosis of tetraploid?

(a) Two bivalent

(b) One bivalent and two univalent

(c) Trivalent and univalent

(d) Quadrivalent

The question was asked in a national level competition.

The question is from Chromosomal Abnormalities : Euploidy in division Chromosomal Basis of Inheritance of Cytogenetics

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Correct option is (b) One bivalent and two univalent

For explanation I would say: In normal pairing all available chromosomes with complimentary are paired, so the existence of two univalent which are free to pair is not possible. However in case of trivalent and univalent as one of the other set is not available univalent exists.

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