How does the genetically active portion of the nuclear chromatin look when stained with Wright stain?
a. Condensed, darkly stained
b. Clumped, dark purple
c. Ropelike, pink or red
d. Diffuse, uncondensed and pale blue
ANS: D
The genetically active portion of the nuclear chromatin, composed of DNA plus supporting proteins, appears diffuse and uncondensed and stains pale blue with Wright stain. It is also called euchromatin. Chromatin, which is condensed and stains darkly, is also called heterochromatin; it is the genetically inactive portion of the nucleus.
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