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3.3 Inheritance

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Question 3

In sheep, allele b b\,b for an inherited condition is recessive to allele BBB.

A farmer selects an unaffected male sheep and an unaffected female sheep from unrelated families.

Selected sheepPhenotype of selected sheepPhenotypes of both parentsPhenotype of one sibling with the same parents
maleunaffectedboth unaffectedaffected
femaleunaffectedboth unaffectedaffected

Explain the probability that the first lamb produced by these two sheep will have the inherited condition.

You may use genetic diagrams in your answer.

[6]
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3.3 Inheritance Questions

  1. GCSE
  2. /Biology
  3. /3.3 Inheritance

71 exam-style questions on Edexcel GCSE Biology 3.3 Inheritance, covering 3.3.1 Gregor Mendel and the basis of genetics, 3.3.2 Alleles and inherited characteristics, 3.3.3 Monohybrid inheritance, 3.3.4 Determination of sex at fertilisation, 3.3.5 Outcomes from monohybrid crosses, 3.3.6 Inheritance of ABO blood groups, 3.3.7 Inheritance of sex-linked disorders, and 3.3.8 Multiple genes and phenotypic features. Each one has a worked solution and a mark scheme showing where the marks go.

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