Solution

Sex-limited traits are controlled by autosomal genes, but they are expressed in only one sex, because their expression depends on the sex hormones.
The genes for beard and moustache growth are present in both men and women, but they are expressed only in males under the influence of testosterone.
Pattern baldness is also autosomal and expressed mainly in males because of the male hormones (strictly it is described as sex-influenced, since it is dominant in males and recessive in females).
Sex-linked traits, such as haemophilia and colour blindness, are due to genes on the X chromosome.
So these are examples of sex limited traits.

Concept Sex-limited traits

Principles of Inheritance and Variation in past papers

198 questions from this chapter have appeared across 27 exam years.