Sex-linked characters are

The correct option is D Dominant or recessive
Sex-linked character, an observable feature of an organism controlled by the genes on the chromosomes that determine the organism's sex. They can be dominant or recessive in nature. Y-linked and X-linked recessive diseases usually occur in males because males have only one X chromosome. A single recessive gene on that X chromosome will cause the disease. Diseases such as hemophilia and Duchenne muscular dystrophy occur from a recessive gene on the X chromosome. Y-linked disorders are azoospermia and Retinitis Pigmentosa. Thus, the correct answer is option D.