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Objective: Explain how sex-linked traits are inherited.
Materials: ballpen, answer sheet (page 10 of this module)
Procedure:
1. Study carefully the pedigree below.
2. Take note of the shapes, shades, and the legend in the given pedigree.
3. Answer the critical thinking questions that follow.
Answers & Comments
Sex-linked diseases are passed down through families through one of the X or Y chromosomes. X and Y are sex chromosomes. Dominant inheritance occurs when an abnormal gene from one parent causes disease, even though the matching gene from the other parent is normal. The abnormal gene dominates.