<P> Karyotypes describe the chromosome count of an organism and what these chromosomes look like under a light microscope . Attention is paid to their length, the position of the centromeres, banding pattern, any differences between the sex chromosomes, and any other physical characteristics . The preparation and study of karyotypes is part of cytogenetics . </P> <P> The study of whole sets of chromosomes is sometimes known as karyology . The chromosomes are depicted (by rearranging a photomicrograph) in a standard format known as a karyogram or idiogram: in pairs, ordered by size and position of centromere for chromosomes of the same size . </P> <P> The basic number of chromosomes in the somatic cells of an individual or a species is called the somatic number and is designated 2n . In the germ - line (the sex cells) the chromosome number is n (humans: n = 23). Thus, in humans 2n = 46 . </P> <P> So, in normal diploid organisms, autosomal chromosomes are present in two copies . There may, or may not, be sex chromosomes . Polyploid cells have multiple copies of chromosomes and haploid cells have single copies . </P>

Term for number of chromosomes for body except gametes 46 chromosomes