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    Biology: Genetics Quiz
Select the Matching Pairs
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

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