Autosomal Recessive Traits Appear with Equal Frequency in Males and Females

Autosomal recessive traits appear with equal frequency in males and females. Affected children are commonly born to unaffected parents who are carriers of the gene for the trait, and the trait tends to skip generations. Recessive traits appear more frequently among the offspring of consanguine matings.
-Autosomal recessive traits often appear in pedigrees in which there have been consanguine matings, because these traits

A) tend to skip generations.
B) appear only when both parents carry a copy of the gene for the trait, which is more likely when the parents are related.
C) usually arise in children born to parents who are unaffected.
D) appear equally in males and females.