Final answer:
Males more commonly express recessive X-linked traits due to having only one X chromosome. However, females can express these traits if they inherit two recessive alleles. Thus, the statement is not entirely accurate as females, though less commonly, can express recessive sex-linked traits.
Step-by-step explanation:
The statement that only a male human offspring can express a recessive sex-linked X chromosome mutation is not entirely accurate. While it is true that recessive X-linked traits are more commonly expressed in males due to their having only one X chromosome, females can also express these traits if they inherit two recessive alleles, one from each parent. This is less likely to happen because females with one recessive and one dominant allele on the X chromosome will be carriers, usually without expressing the trait. Conditions such as red-green color blindness, hemophilia, and muscular dystrophy are X-linked recessive disorders that exemplify this inheritance pattern.