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B
Xenopsylla
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C
Branchiomyces
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D
Mouse
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Solution
The correct option is A Drosophila
The salivary gland chromosome is also known as polytene chromosomes.
These chromosomes are found during the interphase stage of the cell division in the nuclei of the salivary gland cells of the larvae of Diptera (fruitfly or Drosophila melanogaster).
These are also known as giant chromosomes and are smaller than lampbrush chromosomes.