Question

Chromosome type in which p-arm is absent is called as ________.

• A. Metacentric
• B. Sub-metacentric
• C. Acrocentric
• D. Telocentric

Answer 1

The correct option is D Telocentric

Short arm of chromosome is called p-arm and long arm is called q-arm
Metacentric – p=q
Sub-metacentric – p>q
Acrocentric – p>>q
Telocentric – p arm is absent

• The metacentric chromosome has middle centromere forming two equal p and q arms of the chromosome.
• The sub-metacentric chromosome has centromere slightly away from the middle of the chromosome resulting shorter p arm and longer q arm.
• In case of acrocentric chromosome the centromere is situated close to its end forming one extremely short p arm and one very long q arm, whereas the telocentric chromosome has a terminal centromere where the p arm is absent.