Final answer:
X-linked dominant traits are more common in females because they have two X chromosomes. An example of an X-linked dominant trait is Rett syndrome. In contrast, males only need to inherit one copy of the mutant allele to express the trait.
Step-by-step explanation:
X-linked dominant traits are more common in females because they have two X chromosomes. In order for a male to have an X-linked dominant trait, he only needs to inherit one copy of the mutant allele from his mother. However, females need to inherit the mutant allele from both parents to express the trait. An example of an X-linked dominant trait is Rett syndrome, a neurodevelopmental disorder.