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In salivary gland chromosomes/polytene chromosomes, pairing is

1. absent
2. occasional
3. formed between nonhomologous chromosomes
4. formed between homologous chromosomes

Correct answer: formed between homologous chromosomes

Solution

Polytene chromosomes arise from repeated DNA replication without cell division, so many sister chromatids remain aligned. In salivary gland chromosomes, the pairing occurs between homologous chromosomes, producing the characteristic banding pattern.

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