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| Description: Human mitotic metaphase chromosomes are identified by size, centromere location, and banding pattern. The relative size, centromere locations, and banding patterns for three representative human chromosomes are shown. Chromosome 3 is one of the largest human chromosomes and, because the centromere is centrally located, is a metacentric chromosome. Chromosome 17 is a submetacentric chromosome because the centromere divides the chromosome into two arms of unequal size. Chromosome 21 has a centromere placed very close to one end and is called an acrocentric chromosome. In humans, the short arm of each chromosome is called the p arm, and the long arm is called the q arm. The symbol p was chosen for the short arm because it stands for the word “petit,” which in French means small. The symbol q was chosen for the long arm because it is the next letter in the alphabet. Picture Stats: Views: 173 Filesize: 120.12kB Height: 751 Width: 1500 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=44286 |