BRAINCAKEChanges in Allele Frequencies
Mutation leads to the formation of new alleles. Natural selection will favour advantageous alleles and lead to an increase allele frequency. Sexual selection will lead to an increase in characteristics that encourage mating.
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Key terms in this lesson
- mutation
- A random change in the base sequence of DNA (a gene mutation) or in the structure or number of chromosomes (a chromosome mutation).
- allele
- One of two or more alternative versions of a gene, occupying the same locus on homologous chromosomes.
More in Genetics and Variation
- Linkage
- Χ-squared Test
- Epistasis
- The Hardy-Weinberg Principle
- Population Bottlenecks and The Founder Effect
- Types of Selection
- Species
- Allopatric Speciation
All 36 lessons in Genetics and Variation · All AQA A-level Biology topics