| A | B | 
| Selective Breeding | a method of improving a species by allowing only those individual organisms with desired characteristics to produce the next generation | 
| Hybridization | the breeding technique that involves crossing dissimilar individuals to bring together the best traits of both organisms | 
| Inbreeding | the continued breeding of individuals with similar characteristics | 
| Polyploid | having many sets of chromosomes | 
| Genetic Engineering | the process of making changes in the DNA code of living organisms | 
| Restriction Enzyme | the enzyme that cuts DNA at a specific sequence of nucleotides | 
| Gel Electrophoresis | the procedure used to separate and analyze DNA fragments by placing a mixture of DNA fragments at one end of a porous gel and applying an electrical voltage to the gel | 
| Recombinant DNA | DNA produced by combining DNA from different sources | 
| Polymerase Chain Reaction (PCR) | the technique that allows molecular biologists to make many copies of a perticular gene | 
| Plasmid | the circular DNA molecule found in bacteria | 
| Genetic Marker | the gene that makes it possible to distinguish bacteria that carry a plasmid with foreign DNA from those that don't | 
| Transgenic | a term used to refer to an organism that contains genes from other organisms | 
| Clone | a member of a population of genetically identical organisms produced from a single cell |