Sex-linked genes are genes located on the sex chromosomes (the X and Y chromosomes) rather than the autosomes. While the term "sex-linked" is often used to refer specifically to genes on the X chromosome because it contains significantly more genes (about 800–900) than the Y chromosome (about 60–70), scientific definitions include both. X-linked genes are found on the X chromosome; examples include red-green color blindness and hemophilia while the Y-linked genes are found on the Y chromosome; these are passed only from father to son and are often involved in male sex determination (e.g., the SRY gene).
Although the term is frequently used as a synonym for "X-linked" in many Biology textbooks, it is technically incomplete because genes on the Y chromosome are also considered sex-linked. Hence, option B is more accurate when compared to option D.
There is an explanation video available below.
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