Chromosomes are made of strands of DNA wrapped around spools of protein called histones and organized into distinct packets. Each chromosome is made of proteins and a single molecule of deoxyribonucleic acid DNA. Dna Chromosomes And Cells Chromosome Dna Dna Project The egg contributes one sex chromosome X only and 22 autosomes. . Chromatin is located in the. The chromosomes and genes are made of DNA which is short for deoxyribonucleic say. The packets are accessible for copying in the cell and are. A dictionary of more than 150 genetics-related terms written for healthcare professionals. The sperm contributes one sex chromosome X or Y and 22 autosomes. A human being is made out of 100000 billion cells. Chromatin DNA molecule Protein Centromere Arm Telomere Components of a. Each one has a nucleus in which there are 23 pairs of chromosomes. 1 Chromosomes are mainly made up of DNA and histone proteins tightly