Gene
Section of DNA that codes for a protein or trait
Allele
Different versions of a gene
Recessive
Less powerful allele
Dominant
More powerful allele
Homozygous
TT/tt: 2 of the same alleles for a trait
Heterozygous
2 different alleles for a trait
Genotype
Set of alleles/letters that get passed on
Phenotype
What shows up in your physical appearance