| Different genes are ____ (activated) in different types of cells. |
circular |
| Introns are ____ from pre-mRNA to form mRNA. |
coiled |
| A ____ genotype has two identical alleles. |
de novo |
| Mitochondria and chloroplasts have their own ____ DNA. |
expressed |
| A ____ mutation was not inherited from either parent. |
heterozygous |
| DNA is ____ into strands called chromosomes. |
homozygous |
| A ____ genotype has two different alleles. |
spliced |
| A chromosome has hundreds or ____ of genes. |
thousands |
