Concept:Sex-linked characters are controlled by genes located on sex chromosomes, mainly the
X chromosome.
Explanation:Option A is true because sex-linked genes are usually present on the
X chromosome.
Option B is true because males have only one
X chromosome, so recessive sex-linked traits appear more often in males.
Option C is not true because males cannot usually be carriers.
A male who has a recessive allele on his single
X chromosome will express the trait, not merely carry it.
Option D is true because these genes are generally not carried on the
Y chromosome.
Therefore, the false statement is Option C.
Answer:C. Males are usually carriers