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5.1 Inheritance

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Question 21

Tail pattern in a species of lizard is controlled by one gene. Lizards with either genotype BB BB\,BB or Bb Bb\,Bb have banded tails; only bb bb\,bb lizards have plain tails.

A breeding pair is selected. Both lizards have genotype BbBbBb, and they produce 240 young.

How many of the young would be expected to have banded tails?

[1]
A

180180180

B

120120120

C

606060

D

240240240

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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