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GCSE Biology · key term
A different version of a gene.
Used by AQA, Edexcel and OCR
Specification 4.6.1.6, 4.6.1.7, 4.6.2.3 · Paper 2
One of the different forms of a particular gene.
Revise: Key Vocabulary and Principles of Genetic InheritanceDifferent forms of the same gene are called alleles.
A form of a gene.
A form of a gene. Different alleles contribute to genetic variation within a population.
Specification 3.12, 3.13, 3.16, 3.17B · Paper 1
A different version of the same gene, with a variation in its DNA base sequence.
Revise: AllelesDifferent versions of the same gene are called alleles. An organism therefore commonly has a pair of alleles for a gene, and the two alleles may be the same or different.
An alternative version of a gene.
One of the different versions of a gene.
Specification B5.1i, B5.1m, B5.2a · Paper 2 (Foundation), Paper 4 (Higher)
A variant of a gene.
Revise: Single gene inheritanceGenes are sections of DNA, and different versions of the same gene are called alleles. In a simple single-gene example, an offspring receives one allele from each parent. Its pair of alleles is its genotype for that gene; the feature that can be observed is part of its phenotype.
An alternative version of a gene.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
One version of a particular gene.
Revise: Genetic TerminologyDifferent versions of the same gene are called alleles. For example, suppose a plant has a gene involved in flower colour. The copy of that gene on one chromosome and the copy on its partner chromosome occupy corresponding positions, but the plant could carry the same allele twice or two different alleles.
A version of a gene. In a diploid organism, an individual usually has two alleles of each gene, one inherited from each parent.
For a single-gene characteristic, use the same letter in upper and lower case for its dominant and recessive alleles, such as R and r.
A heterozygous organism still carries the recessive allele even when its phenotype shows the dominant characteristic.
State whether an allele is dominant or recessive before linking the genotype to the disorder.
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