DNA, Genes and Chromosomes 0.0 / 5 ? BiologyDNA and inheritanceIGCSEEdexcel Created by: SamDaviesCreated on: 06-03-14 18:27 DNA Long list of chemical instructions 1 of 9 Chromosomes Long lengths of DNA all coiled up 2 of 9 Genes Short sections of DNA. Each gene codes for a particular protein 3 of 9 Protein Important as they control most of the processes in our body and they determine our inherited characteristics, e.g. eye colour, blood type 4 of 9 Alleles Different versions of the same gene 5 of 9 Double helix The two strands of a DNA molecule are coiled together in a double helix 6 of 9 Bases Chemicals which hold the DNA strands together. Complementary bases are Adenine (A) with Thymine (T) and Cytosine (C) with Guanine (G) 7 of 9 Diploid Two copies of each chromosome arranged in pairs. Human body cells are diploid so their diploid number is 46 8 of 9 Haploid A single set of unpaired chromosomes. Gametes are haploid so their haploid number is 23 (half the number of chromosomes in a normal cell) 9 of 9
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