| A | B |
|---|
| heredity | passing of traits from parent to offspring |
| allele | different form of a gene |
| genetics | the study of heredity |
| dominant | the form of a trait that appears to dominate or mask another form of the same trait |
| recessive | the form of a trait that appears to disappear, or be masked by a dominant trait |
| Punnett square | a tool that shows how genes can combine; used to predict the probability of types of offspring |
| genotype | the genetic makeup of an organism for a trait |
| homozygous | an organism that has 2 identical alleles for a trait |
| heterozygous | an organism that has 2 different alleles for a trait |
| phenotype | a physical trait that shows as a result of an organism's particular genotype |
| chromosome | rod-shaped structures that are located in the nucleus of every cell in an organism |
| mutation | any permanent change in an organism's genetic material |
| incomplete dominance | when 2 traitscombine and show up as a third trait |
| gene | basic unit of heredity |
| sex-linked gene | an allele inherited ona sex chromosome |
| replication | process in which DNA molecules form exact duplicates |
| nondisjunction | failure of chromosomes to separate from one another |
