Inside the nucleus of most cells are 46 chromosomes, 23 pairs. They contain the instructions for our bodies to work.l A section of a chromosome is called a chromatid. The central part of the chromosome is called a centromere. Chromosomes are DNA that has been tightly woven toghether. When it is uncoiled, the structure of the DNA is a double helix. A gamete is a sex cell and these are found in the reproductive organs. There is half of the number of chromosomes so we say there is a haploid amount, A normal cell is a diploid amount.
