BRAINCAKEAlleles
An allele is one of a number of alternative forms of a gene.
Alleles may arise by mutation. The different alleles have different base sequences and therefore code for different polypeptides.
Each individual inherits a gene from each parent. They may inherit the same alleles from each parent or the alleles may be different.
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Key terms in this lesson
- gene
- A length of DNA that codes for a polypeptide or a functional RNA molecule, at a specific locus on a chromosome.
- mutation
- A random change in the amount, arrangement or base sequence of the DNA of an organism.
More in DNA, Genes and Protein Synthesis
- The Genetic Code
- Features of the Genetic Code
- Chromosomes
- Homologous Chromosomes
- The Human Karyotype
- Protein Synthesis
- RNA
- mRNA
All 15 lessons in DNA, Genes and Protein Synthesis · All AQA AS-level Biology topics