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IB Biology Exam Prep

Category - Biology

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A scientist is studying the inheritance of two traits encoded by two different genes: eye color and hair color. Brown eye color is dominant of green eye color; brunette hair color is dominant over blond hair color. If parent A is homozygous for both brown eyes and brunette hair and parent B is heterozygous for brown eye color and brunette hair, what is the likelihood that an offspring will be born with green eyes and blond hair?
  1. 50%
  2. 25%
  3. 15%
  4. 10%
  5. 0%
Explanation
Answer: E, 0%. In this scenario, it is impossible for an F1 offspring to have green eyes and blond hair.

Key Takeaway: Using the Punnett square, it is obvious that any offspring will inherit at least one copy of the genes for brown eye color and brunette hair from Parent A. Recessive traits only appear in the offspring when inherited from both parents. With these parents, offspring can only be homozygous or heterozygous for both brown eye color and brunette hair.
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