Final answer:
None of the given options represent a homozygous dominant genotype because they all consist of lowercase letters, indicating that they are homozygous recessive.
Step-by-step explanation:
To select all of the choices that can represent a homozygous dominant genotype, we must look for pairs of letters that are both uppercase, as uppercase letters represent dominant alleles in genetic notation. None of the given options (1) gg, (2) kk, (3) aa, (4) tt, (5) mm, (6) uu, (7) rr represent a homozygous dominant genotype since they are all lowercase, which indicates that they are homozygous recessive genotypes. Remember, a homozygous dominant genotype would be written with two uppercase letters, such as AA or BB, not lowercase.
For example, the genotypes VV or NN would represent a homozygous dominant genotype for pea plants with violet flowers or some other dominant trait respectively. In contrast, vv or nn would represent a homozygous recessive genotype for the corresponding traits.