Edexcel IGCSE Biology · Spec 3.24
Family Pedigrees
How to read and interpret family pedigree diagrams to follow inherited characteristics.
Biology revision video
Family Pedigrees
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Spec 3.24
What you need to know
- Read the symbols in a pedigree chart
- Follow a characteristic through a family
- Work out whether a condition is recessive
Active recall
Quick check
Answer each question before opening the answer.
How can you tell an allele is recessive from a pedigree?
Two unaffected parents have an affected child, showing they were carriers of a hidden recessive allele.
What does a pedigree diagram show?
How a characteristic is inherited through the generations of a family.
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