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