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GCSE Combined Science · key term
A person who has one copy of a recessive allele causing a disorder, does not have that disorder, but can pass the allele to their offspring.
Used by AQA and Edexcel
Specification 4.6.1.5 · Paper 2
Revise: Inherited DisordersA carrier has one copy of the recessive allele. They do not have the disorder, but they can pass that allele to a child. This explains how two parents without cystic fibrosis can have a child with it: both parents may be carriers.
Paper 1, Paper 2
A heterozygous individual who has an allele for a recessive disorder without showing the disorder, but can pass that allele to offspring.
Revise: Alleles and inheritance patternsThe key explains shading: it may show affected individuals, carriers or particular genotypes.
A cystic fibrosis carrier is unaffected but can pass on the recessive allele. Do not count carriers as having the disorder.
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