Question

Assertion :During anaphase, centromere of each chromosome splits and chromatids separate.
Reason ::During anaphase, chromatids move to opposite poles.

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (B)

In anaphase, chromosomes are arranged on the equatorial plate for a short period. In anaphase centromeres of chromosomes start to divide into two, forming daughter chromatids with centromere in each. Daughter chromosomes are repulsive so, migrate towards opposite poles. Spindle fibres attached to the centromeres shorten and pull the chromosomes to the poles. In anaphasic movement of chromosomes, the centromeres lead the path while the limbs trail behind. So anaphasic chromosomes appear as $V-,L-,J-$ and $I$-shaped.