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5.1 Inheritance

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Question 13

In a species of land snail, one gene controls whether the shell has stripes. The allele for a striped shell (SSS) is dominant to the allele for an unstriped shell (sss).

Two heterozygous snails are crossed. The alleles carried by their gametes are shown around the grid.

SSSsss
SSS
sss

Complete the grid by writing the offspring genotype in each empty cell.

[2]
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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