| A | B |
| allele | each member of a gene pair that determines a sepcific trait |
| amino acids | building blocks of proteins |
| amniocentesis | process that involves the removal of a small amount of fluid from the sac that surrounds a developing baby |
| chromosomes | rod-shaped structures found in the nucleus of every cell in an organism |
| codominant | alleles that are both expressed when both are inherited |
| deoxyribonucleic acid | molecule that stores and passes on genetic information from one generation to the next |
| DNA | deoxyribonucleic acid |
| dominant | trait that is expressed when two different genes for the same trait are present |
| genes | units of heredity; segments of DNA on chromosomes |
| genetic engineering | process in which genes, or pieces of DNA, from one organism are transferred into another organism |
| genetics | study of heredity |
| genotype | gene makeup of an organism |
| hybrid | organism that has two different genes for a triat, or that combines traits of two different but related species |
| hybridization | crossing of two genetically different but related species of organisms |
| inbreeding | crossing plants or animals that have the same or similar sets of genes, rather than different genes |