If a study of several pedigrees demonstrated that two parents are normal but their children express a trait, then the trait is controlled by a

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Quizplus · Accepted Answer

The trait is likely controlled by a recessive gene, as both parents can be carriers (heterozygous) without expressing the trait, but can pass the recessive allele to their children, who express the trait if they inherit two recessive alleles.

If a Study of Several Pedigrees Demonstrated That Two Parents