| A | B |
| probability | the likelihood that a particular event will occur |
| genotype | its genetic make-up |
| heterozygous | an organisim that has two different alleles for a trait |
| phenotype | its physical appearance |
| homozygous | has two identical alleles for a trait |
| Mendel | first to recognize that probability could be used to predict genetics |
| Punnett square | chart that shows all combinations of alleles |
| predicting | calculating a possible outcome |
| genetic cross | combining two different traits |
| geneticist | one who studies genetics |