Genetic inheritance

• Phenotype is the physical characteristic of a gene
• A gene controls a characteristic (E.g height)
• An allele is different forms of a gene (e.g. blonde hair and brunette hair). The dominant allele is represented with a capital letter and the recessive allele is represented with the lower case version of the same letter
• Homozygous genotype: two alleles of a gene are the same
• heterozygous genotype: two alleles of a gene are different
• Recessive: allele needs to occur in both chromosomes to be expressed
• Dominant allele: can be present in one chromosome to be expressed