Gene - a short section of DNA that codes for a particular characteristic., Allele - One of two possible versions of a gene, Phenotype - The outward appearance of a feature ( Blue eyes), Genotype - The genetic makeup represented by two letters, Homozygous - The two alleles are the same allele in the genotype, Heterozygous - The two alleles of a particular gene are different, Dominant - Dominants allele overrides the recessive allelle, Recessive - An allele that will only show in the phenotype if both alleles are recessive ( no dominant allele present), Chromosome  - a genetic structure that occurs in functional pairs in the nucleus of a cell. ( except gametes where there is only one chromosome from each pair), DNA - Deoxyribonucleic Acid - molecule that forms genes and chromosomes, Double Helix - Shape of DNA, Genome - The entire genetic makeup of an individual, Mutation - Random change to the structure of a gene or number of chromosomes, Cancer - Uncontrollable cell division, Karyotype - Photograph of all the chromosomes in a cell, Pedigree Diagram - A diagram that shows how a particular condition is inherited through different generations of a family, Genetic Screening - A process used to test people for the presence of particular harmful alleles or genetic abnormalities , Aminocentesis - A process in which the foetal cells are obtained from the amniotic fluid and then examined for the presence of genetic abnormalities ,

Genetics terms

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