Chromosomes consists of DNA which is highly condensed. This is so to allow better manipulation during cell division. They can be viewed as packages of numerous genes. Each eukaryotic species has unique number and size of chromosomes. Chromosomes are paired, and each one consists genes for same trait, but they are not usually the same. They are called homologous. They are diploid. If cell does not have two copy's of homologous it is haploid.