When the centromere is situated in the middle of two equal arms of chromosomes, the chromosome is referred as :

The correct answer is Metacentric.

Chromosomes are classified according to the position of the centromere, which is the region where the two sister chromatids are joined and where spindle fibers attach during cell division.

When the centromere is located exactly in the middle of the chromosome, the two arms (the short arm _p and the long arm _q) are of equal length. This symmetrical arrangement is called a metacentric chromosome.

Other centromere positions give rise to different classifications:

• Sub‑metacentric: centromere is slightly off‑center, producing arms of unequal length.
• Acrocentric: centromere is near one end, creating a very short _p arm and a long _q arm.
• Telocentric: centromere is at the very end of the chromosome, effectively having only one arm.

Since the question specifies that the centromere is situated in the middle of two equal arms, the chromosome fits the definition of a metacentric chromosome.