If a study of several pedigrees demonstrates that two parents are normal but some of their children express a trait, then the trait is controlled by a
A)codominant gene.
B)simple dominant gene.
C)recessive gene.
D)sex-linked gene.
E)No conclusion can be drawn.

Question

Quizplus · Accepted Answer

If two parents are normal but some of their children express a trait, it suggests that the trait is controlled by a recessive gene. Both parents are likely carriers of the recessive allele, which can be passed on to their offspring, resulting in the expression of the trait in some children.

If a Study of Several Pedigrees Demonstrates That Two Parents