Gene: A length of DNA that codes for the production (via mRNA) of one or more polypeptides or codes for the direct production of rRNA or tRNA.
Allele: A variant form of a particular gene. There may be two, several or very many alleles of a gene.
Genotype: The alleles present in an individual or cell
Genome: The sum total of genes in an organism
Phenotype: The expression of the alleles of the genotype, giving the individual's observable traits.
Homozygote: A genotype in which the two alleles of a gene are identical e.g. AA or aa
Heterozygote: A genotype in which the two alleles of a gene are different e.g. Aa
Dominant Allele: Has the same effect on the phenotype when it is heterozygous or homozygous. It is symbolised by…