Introduction:
A chromosome is a long, coiled-up strand of DNA that contains genes, regulatory elements, and other genetic material. Each chromosome has a distinct structure that determines its function, and one of the key features of this structure is the number of arms it has.

Definition of Chromosome Arm:
A chromosome arm is one of the two main sections of a chromosome that are separated by a centromere. Each chromosome has two arms, known as the p arm and the q arm. The p arm is the shorter of the two and is located towards the top of the chromosome, while the q arm is the longer arm and is located towards the bottom.

Number of Chromosome Arms:
Every chromosome has two arms, which are separated by a centromere. Therefore, the number of arms a chromosome has depends on the number of chromosomes present in the organism's cells. Humans have 46 chromosomes in their cells, which means they have a total of 92 chromosome arms (46 x 2).

Conclusion:
In summary, chromosomes have two arms, the p arm and the q arm, which are separated by a centromere. The number of arms a chromosome has depends on the number of chromosomes present in the cells of an organism. Humans have 46 chromosomes and therefore have a total of 92 chromosome arms.

Centromere divides the chromosome into two arms. The short arm of the chromosome is labeled as "p arm" and long arm is as "q arm"