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4.24 Family pedigrees
Exam question
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In a family pedigree two unaffected parents have an affected child. Explain what this shows about the allele causing the condition.
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Total for this question: 3 marks
4.24 Family pedigrees
Exam question
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In a pedigree, what does a shaded circle usually represent?
(1)Total for this question: 1 mark
4.24 Family pedigrees
Exam question
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Explain how a pedigree can show that a condition is caused by a dominant allele.
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Total for this question: 2 marks
4.24 Family pedigrees
Exam question
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Two affected parents have an unaffected child. Deduce the genotypes of the parents if the condition is dominant (D).
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Total for this question: 2 marks
4.24 Family pedigrees
Exam question
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Explain why pedigrees are useful to genetic counsellors.
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Total for this question: 2 marks
4.24 Family pedigrees
Exam question
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Suggest why it can be hard to tell from a small pedigree whether an allele is dominant or recessive.
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Total for this question: 2 marks
4.24 Family pedigrees
Exam question
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State what a horizontal line joining a circle and a square shows in a pedigree.
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Total for this question: 1 mark
4.24 Family pedigrees
Exam question
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Two carriers of a recessive condition already have one affected child. Calculate the probability that their next child is affected.
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Total for this question: 2 marks
4.24 Family pedigrees
Exam question
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Explain how to identify a carrier in a pedigree for a recessive condition.
(2)Write your answer, then press Show model answer and tick each mark point your answer makes. Your answer is not saved.
Total for this question: 2 marks
