| A ____ mutation was not inherited from either parent. |
aromatic |
| Purines have two ____ rings, whereas pyrimidines have one. |
coiled |
| ____ recessive conditions affect males more than females. |
de novo |
| A ____ genotype has two different alleles. |
expressed |
| DNA is ____ into strands called chromosomes. |
heterozygous |
| Introns are ____ from pre-mRNA to form mRNA. |
spliced |
| A chromosome contains hundreds or ____ of genes. |
thousands |
| Different genes are ____ (activated) in different types of cells. |
X-linked |
