| A | B |
|---|
| heredity | the passing of traits from parent to offspring |
| trait | a characteristic that an organism can pass on to its offspring through its genes |
| genetics | the scientific study of heredity |
| fertilization | process in which a sperm cell and an egg cell join to form a new organism |
| purebred | an organism that has two of the same alleles for a trait |
| gene | the set of information that controls a trait |
| alleles | different forms of a gene |
| dominant allele | an allele whose trait always shows up in the organism when the allele is present |
| recessive allele | an allele that is masked when a dominant allele is present |
| hybrid | an organism that has two different alleles for a trait |
| hybrid | an organism that is heterozygous for a particular trait |
| gene | a segment of DNA on achromosome that codes for a specific trait |
| probability | a number that describes how likely it is that an event will occur |
| Punnett Square | a chart that shows all the possible combinations of alleles that can result from a genetic cross |
| phenotype | an organism's physical appearance or visible trait |
| genotype | an organism's genetic make up , or allele combination |
| homozygous | having two identical alleles for a trait |
| heterozygous | having two different alleles for a trait |
| codominance | a condition in which neither of two alleles of a gene is dominant or recessive |
