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The formation of multivalents at meiosis in a diploid organism is due to

1. inversion
2. deletion
3. monosomy
4. reciprocal translocation

Correct answer: reciprocal translocation

Solution

Reciprocal translocation swaps segments between nonhomologous chromosomes, so during meiosis the involved chromosomes pair as a multivalent rather than a simple bivalent. This complex pairing is characteristic of translocation heterozygotes.

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