Models of single-gene inheritance: family tree diagrams
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I can construct and interpret family tree diagrams showing information about inheritance of a feature.
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Offspring inherit two alleles, one from each parent, the combination of these alleles is the genotype.
The phenotypes of members of a family can be shown in a diagram such as a family tree (pedigree).
A family tree diagram is a model of inheritance, showing whether a characteristic was passed from parents to offspring.
A family tree can be used to work out an individual’s genotype if their phenotype and relatives’ genotypes are known.
A family tree can be used to determine the history and probability of genetic disorders: cystic fibrosis and polydactyly
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