A study of several pedigrees demonstrates that two parents are normal.If some of their children express a trait,then the trait is controlled by a:

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If two normal parents produce children that express a trait, then the trait is likely controlled by a recessive gene. This means that both parents are carriers of the gene, but do not express the trait themselves. If the trait was controlled by a codominant or simple dominant gene, at least one of the parents would also express the trait. If the trait was controlled by a sex-linked gene, the inheritance pattern would be different and the pedigrees would show a different pattern of inheritance.

A Study of Several Pedigrees Demonstrates That Two Parents Are