| A | B |
|---|
| Dominant | The allele that has the ability to mask the other allele |
| Recessive | the alllele that can be masked |
| Allele | the choices of a gene a person has |
| Genotype | the two alleles a person has for characteristics |
| Phenotype | the physical characteristic that is coded for by the alleles |
| Monohybrid cross | crossing one characteristic at a time |
| Dihybrid cross | crossing two characteristics at a time |
| Incomplete dominance | when one alllele does not totally maske another allele |
| Epistasis | when one allele can block another allele from showing |
| Cystic fibrosis | a genetic disorder in which mucus builds up in the body |
| Hemophilia | a genetic disorder in which the blood does not clot correctly |
| Down syndrome | a genetic disorder caused by an extra copy of chromosome 21 |
| Sickle cell anemia | a genetic disorder in which the red blood cell changes shape |
| Pedigree | A family history of a genetic trait |
| Homozygous | having identical alleles for a charateristic |
| Heterozygous | Having different alleles for a characteristic |
