Living Environment Translated Arabic 2014 | Page 54

16.Mutation- a change in the nitrogen bases in DNA
17. Polygenic inheritance- a trait that is produced by two or more
genes
18. Genetic engineering-the process of changing an organism’s DNA
to give the organism new traits
19.Recombinant DNA- genetically engineered DNA that contains
genes from more than one organism
20.Gene therapy-a procedure used to treat a disease in which a
defective or missing gene is replaced or a new gene is inserted