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If a diploid cell is treated with colchicine then it becomes

1. triploid
2. tetraploid
3. diploid
4. monoploid

Correct answer: tetraploid

Solution

Colchicine inhibits spindle fiber formation, so sister chromatids cannot separate during mitosis. The cell replicates its DNA but fails to divide, doubling the chromosome set from diploid to tetraploid.

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