Phenotype is the physical characteristic of a gene
A gene controls a characteristic (E.g height)
An allele is differentforms of a gene (e.g. blonde hair and brunette hair). The dominant allele is represented with a capital letter and the recessiveallele is represented with the lower case version of the sameletter
Homozygous genotype: two alleles of a gene are the same
heterozygous genotype: twoalleles 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