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5.1 Inheritance

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Question 25

In a species of beetle, wing-case colour is controlled by a single gene.

  • The allele for black wing cases (KKK) is dominant.
  • The allele for copper wing cases (kkk) is recessive.

Two beetles with black wing cases are crossed. The table shows the phenotypes of their offspring.

Offspring phenotypeNumber of offspring
Black wing cases59
Copper wing cases21
Total80

Explain what the results show about the genotypes of the parent beetles, and predict the expected number of offspring with copper wing cases if the same parents produce 120 more offspring.

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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