Answer:
Heterozygous, Homozygous, Genotype, and Phenotype in that order
Step-by-step explanation:
The word part "Hetero" means different, so the word Heterozygous means different alleles (Ex. Tt)
The word part "Homo" means the same, so Homozygous is the same allele (Ex. TT or tt)
Genotype refers to the alleles/ genetic makeup; you can remember this by associating "Geno" with "Gene."
Phenotype is the PHYSICAL features. Physical is the key to remembering what the phenotype is.