Final answer:
A chromosome is sometimes called a linkage group because it contains genes that are physically linked together. Genes located on the same chromosome are called linked genes and tend to segregate together during meiosis.
Step-by-step explanation:
A chromosome is sometimes called a linkage group because it contains a group of genes that are physically linked together. Genes that are located on the same chromosome are called linked genes. These genes tend to segregate together during meiosis, unless they are separated by crossing-over. The closer together two genes are on a chromosome, the less likely their alleles will be separated by crossing-over.