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5.1 Inheritance

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Question 12
F

A couple both have brown eyes. Their first child has blue eyes.

In this family, eye colour is controlled by a single gene.

  • The allele for brown eyes (B) is dominant.
  • The allele for blue eyes (b) is recessive.

Explain how two parents with brown eyes can have a child with blue eyes, and the probability that their next child will also have blue eyes.

Use a genetic diagram in your answer.

[6]
Markscheme

5.1 Inheritance Questions

  1. GCSE
  2. /Biology
  3. /5.1 Inheritance

186 exam-style questions on OCR GCSE Biology 5.1 Inheritance, covering 5.1.1 The genome, 5.1.2 Environment and phenotype, 5.1.3 Variants and mutations, 5.1.4 How genetic variants influence phenotype, 5.1.5 Asexual and sexual reproduction, 5.1.6 Haploid and diploid, 5.1.7 Meiotic cell division, 5.1.8 Single gene inheritance, 5.1.9 Predicting single gene crosses, 5.1.10 Sex determination, 5.1.11 Multiple gene inheritance, and 5.1.12 Development of our understanding of genetics. Each one has a worked solution and a mark scheme showing where the marks go.

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