Which of the following statements is true about sex-limited traits?

Sex-limited traits are a unique category of genetic traits that manifest exclusively in one sex. For example, traits like milk production in dairy cows or certain secondary sexual characteristics in animals are prominent only in females or males. Although the genes controlling sex-limited traits can be present in both sexes, their expression is restricted to one, highlighting the influence of sex hormones and other biological factors that differentiate the sexes.

The assertion that these traits are only expressed in one sex is central to their definition, distinguishing them from sex-influenced traits, which can be expressed in both sexes but may have differing phenotypic results based on the sex of the organism. Characteristics that fall into other categories, such as recessive or dominant traits, do not specifically pertain to whether a trait is sex-limited; these classifications address how traits are inherited rather than their expression based on sex. Thus, identifying sex-limited traits as being restricted to one sex aligns with the established understanding of their genetic and phenotypic behavior.