| A | B |
|---|
| DNA | the chemical compound of a gene |
| Gene | basic units of heredity |
| Nucleotides | composed of nitrogenous bases, a sugar and phosphate |
| Adenine | bonds with thymine |
| cytocine | bonds with guanine |
| twisted ladder | double helix |
| hydrogen bonds | attach nitrogen bases to each other |
| Proteins | made at the ribosomes |
| Deoxyribose | sugar found in DNA |
| Gene mutation | change in the genetic code of DNA |
| Genetic code | message t the cell to mke certan proteins |
| Karyotyping | photographs of cells chromosomes |
| mRNA | carries genetic code from nucleus to ribosomes |
| mutation | change in gene or chromosome |
| replicate | to make exact copies |
| sickle-cell anemia | genetic disease with abnormal hemoglobin |
| recombinant DNA | DNA which has been changed by genetic engineering |
