Which of the following is an example of a sex-linked trait found in humans?

Color blindness is an example of a sex-linked trait in humans because it is primarily associated with genes located on the X chromosome. In humans, males have one X and one Y chromosome, while females have two X chromosomes. Consequently, a male with a recessive gene for color blindness on his X chromosome will exhibit the trait since he does not have a second X chromosome that could potentially mask it. In contrast, a female would need to inherit the recessive gene on both of her X chromosomes to express color blindness, making the trait more common in males.

The other traits listed, such as eye color, height, and blood type, are not typically considered sex-linked. Eye color is determined by multiple genes and is not confined to a sex chromosome. Height is influenced by many polygenic traits, while blood type is determined by the ABO gene system and is also not located on the sex chromosomes. Thus, color blindness stands out as a clear example of a sex-linked genetic trait.