A) bands
B) loops
C) Both [a] and [b]
D) All of these
Correct Answer: C
Solution :
Polytene chromosome was described by Kollar (1882) and first reported by Balbiani (1881) in the salivary gland cells of Chironomus larva. In polytene chromosome, there present some lighter area between dark bands called interbands. They have puffs bearing Balbiani rings. These produce a number of mRNA, which may remain stored temporarily in the puffs, are temporary structures. These also occur in Malpighian tubules, rectum, gut, foot pads, fat bodies, ovarian nurse cells etc.
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