Metacentric chromosomes—- In which the centromere is near middle and two arms are equal.
Submetacentric chromosome—-Centromere is slightly away from the middle point & hence one arm is slightly short 7 other slightly long.
Acrocentric chromosomes—- Centromere is near the end and hence one arm is very short and other is very long.
Telocentric chromosomes—Centromere is at the end and the arms are on one side only.