Activity 5: Objective: Materials: When Gender Matters Solve problems related to sex-linked traits. activity sheets Procedure: 1. Read the given problem A Color-blindness is a recessive, sex-linked disorder in humans. A color- blind man has a child with a woman who is a carrier of the disorder. KEY X normal vision X color blindness 2. Illustrate using a Punnett square the probability of having children who will have normal vision and children who will be color-blind. Guide Questions: Q 18. What is the genotype of the male? Q 19. What is the genotype of the female? Q 20. What is the chance that the child will be color-blind? Q 21. What is the chance that a daughter will be color-blind? Q 22. What is the chance that a son will be color-blind? Key Concepts • Sex-linked traits are inherited through the X chromosomes. Males have only one X chromosome. Thus, if they inherit the affected X, they will have the disorder Females have two X chromosomes. Therefore, they can inherit/carry the trait without being affected if it acts in a recessive manner Have you seen a bald man? What about a bald woman? It appears that gender matters for the other kinds of traits as well.