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Q.

The region of the chromosome that are darkly stained and transcriptionally inactive is called:

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a

Euchromatin

b

Heterochromatin

c

Cistron

d

Muton

answer is B.

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Detailed Solution

The region of the chromosome that are darkly stained and transcriptionally inactive is called heterochromatin.
The region of the chromosome that are lightly stained and transcriptionally active is called euchromatin.
Cistron is a part of DNA that codes for proteins
Muton is smallest unit of chromosome that can be changed by mutation.

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