Heritable Traits - Characteristics that can be passed down to your children eg. eye colour, DNA - A long molecule that is the instructions for making all your heritable traits, Chromosome - Coiled up bundle of DNA, Gene - A section of DNA that codes for one single trait eg. eye colour, Nucleus - Compartment inside a cell that contains the DNA, Cell - Smallest living thing that makes up the tissue and organs of larger organisms, Nucleotide - Building blocks of the DNA molecule - sugar, phosphate, and a base, Bases - Variable part of a nucleotide: A, T, C, or G, Base Pairing Rule - A pairs with T, C pairs with G, DNA Sequence - The order of bases along the DNA eg. ATTTAGGCGATAGCT, Triplet - Sequence of three bases in a row that codes for one amino acid, Amino Acids - Building blocks of proteins, Protein - Large molecule made up of several amino acids , Homologous Chromosomes - A pair of chromosomes that have the same genes on them one comes from your mum and one from your dad, Heterozygous - When you inherit two different copies of the same gene eg. Bb, Homozygous - When you inherit two of the same copies of a gene eg. bb, Alleles - Different versions of the same gene eg. blue, green, brown eye colour, Genotype - The combination of alleles you have for a particular gene eg. Bb, Phenotype - The physical expression of your genotype eg. blue eyes, Dominant - Version of a trait that gets made even if you only have one allele for it, Recessive - Version of a trait that gets made only when you don't have a dominant allele, Somatic Cells - Body cells not involved in reproduction eg. skin and muscle, Gamete Cells - Cells involved in reproduction eg. sperm and eggs, Haploid - Cells that have only one of each chromosome eg. sperm cells, Diploid - Cells that have pairs of chromosomes eg. body cells, Mitosis - Cell division that makes two identical new cells that are diploid, Meiosis - Cell division that makes four unique cells that are haploid,

11GSC Genetics Terms 1

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