Question

In which type of chromosome, the centromere is located slightly away from the middle?

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

Hint:

Sub-metacentric chromosomes have a centromere slightly off-center, leading to arms of unequal length.

Answer 1

The Correct Option is B

Chromosome classification is determined by centromere placement:

• Metacentric Chromosome: A central centromere creates two equal chromosomal arms.
• Sub-metacentric Chromosome: The centromere is positioned slightly off-center, leading to one arm being marginally longer than the other.
• Acrocentric Chromosome: Situated near one end, the centromere forms one very short arm and one long arm.
• Telocentric Chromosome: The centromere is terminal, resulting in a single arm.

The unequal arm lengths in sub-metacentric chromosomes are a direct result of the centromere's off-center position.