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5.1 Inheritance

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Question 18

In a moth species, dark wings occur in moths with at least one D D\,D allele. Moths with genotype dd dd\,dd have pale wings. Two moths with genotype Dd Dd\,Dd are bred. The expected number of their offspring with pale wings is 48.

How many offspring are expected in total?

[1]
A

969696

B

192192192

C

144144144

D

646464

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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