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5.1 Inheritance

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Question 32
H

Two brothers have the same parents but are not identical twins. The brothers are genetically different.

Which statement explains why?

[1]
A

Each sperm and egg is made by mitosis, so each one has different alleles.

B

Meiosis gives gametes with different alleles, and fertilisation is random.

C

Meiosis gives identical gametes, but the alleles mutate after fertilisation.

D

Each brother inherited all of his alleles from only one of his parents.

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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