First, we will elaborate the terms that are being used.
Heterozygous: This means that the organism has a set of alleles which are different from one another. One copy may be for the dominant trait and the other for the recessive one.
Homozygous: The organism has two copies of the same allele
Dominant: An allele that will express itself even if only one copy of it is present. These are usually represented by capital letters.
Recessive: An allele that requires both copies to be expressed. These are usually represented by lower-case letters.
