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Patterns of inheritance

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Question 13

Scientists crossed two plants that were heterozygous for two different genes. Both plants had the same genotype, DdEeDdEeDdEe.

The genotypes and ratios of the offspring resulting from this cross were:

DDee:DdEe:ddEE1:2:1 \begin{array}{ccccc} \text{DDee} & : & \text{DdEe} & : & \text{ddEE} \\ 1 & : & 2 & : & 1 \end{array} DDee1​::​DdEe2​::​ddEE1​

Which option could explain these observations?

A

Autosomal linkage

B

Crossing over

C

Epistasis

D

Mutation

Markscheme

Patterns of inheritance Questions

  1. A Level
  2. /Biology
  3. /Patterns of inheritance

32 exam-style questions on OCR A A Level Biology Patterns of inheritance. Each one has a worked solution and a mark scheme showing where the marks go.

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