QQuestionBiology
QuestionBiology
What are the chances that two parents with brown eyes and brown hair will give birth to a blue-eyed, blond-haired child?
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Answer
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Step 1:Let's solve this genetics problem step by step:
Step 2:: Understand the Genetic Inheritance
Brown eyes and brown hair are typically dominant traits, while blue eyes and blond hair are recessive traits. We'll use a simplified Mendelian inheritance model.
Step 3:: Determine Genetic Possibilities
For eye color: - Brown eyes (BB or Bb) are dominant - Blue eyes (bb) are recessive For hair color: - Brown hair (HH or Hh) is dominant - Blond hair (hh) is recessive
Step 4:: Probability Calculation
- Probability of blond hair = $$\frac{1}{4}
To have a blue-eyed, blond-haired child, both parents must be carriers of recessive genes. Eye color probability: - Both parents must be heterozygous (Bb) Hair color probability: - Both parents must be heterozygous (Hh)
Step 5:: Combined Probability
\frac{1}{4} \times \frac{1}{4} = \frac{1}{16}
Total probability = Probability of blue eyes × Probability of blond hair
Final Answer
The chance of two brown-eyed, brown-haired parents having a blue-eyed, blond-haired child is \frac{1}{16} or 6.25%.
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