Final answer:
Lyon's hypothesis, or X-inactivation, explains why normal males do not exhibit patterns. In females, one of the X chromosomes is randomly inactivated in each cell to ensure equal gene dosage. Males, having only one X chromosome, do not undergo X-inactivation.
Step-by-step explanation:
Lyon's hypothesis, also known as X-inactivation, explains why normal males do not exhibit patterns. According to this hypothesis, one of the X chromosomes in females is randomly inactivated in each cell during early development. This ensures that both males and females have the same dosage of X-linked genes. In males, since they have only one X chromosome, there is no need for X-inactivation. As a result, they do not exhibit patterns according to Lyon's hypothesis.