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    Biology: Molecular Genetics Quiz
Select the Best Matching Pairs
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

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