Concept:Sex-linked traits are usually controlled by genes present on the
X chromosome.
Explanation:A male inherits his
X chromosome from his mother and the
Y chromosome from his father.
Therefore, a male cannot inherit an
X-linked trait from his father.
So the statement "males inherit sex-linked traits from their fathers" is not correct.
The other statements are true: males are more commonly affected, females can be carriers if heterozygous, and males are never carriers because they have only one
X chromosome.
Answer:Option A is the incorrect statement.