| A | B |
|---|
| Homozygous | two of the same alleles |
| Heterozygous | both alleles are different |
| Allele | genes come in two different forms |
| Genotype | the letters, what the genes are |
| Phenotype | physical traits |
| Dominant | capital letter, will have that trait |
| Recessive | little letter, need two littles |
| Gene | a segment of DNA that codes for a protein |
| Trait | physical characterisitics |
| Sex-linked | found on the X chromosome, from mother to son |
