| A | B |
| heredity | the passing of traits from parent to offspring |
| dominant trait | a trait observed when at least one dominant allele for a characteristic is inherited |
| recessive trait | a trait that is apparent only when two alleles for the characteristic are inherited |
| genes | segments of DNA that carry heredity instructions passed down from parent to offspring |
| alleles | alternative forms of a gene that govern the same characteristics |
| genotype | the inherited combination of alleles |
| phenotype | an irganism's inherited appearance |
| probability | the mathamatical chance than an event will occur |
| sex cells | eggs & sperm; carry 1/2 the number of chromsomes found in other cells |
| homologous chromosomes | chromosomes with matching information |
| meiosis | cell division that produces sex cells |
| sex chromosomes | chromosomes that carry genes that determine the sex of offspring |