new combinations of alleles
What new combinations of alleles means in Biology A-Level, as defined for AQA.
Definitions of new combinations of alleles
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Reference: AQA
Because homologues carry different alleles, crossing over creates entirely new combinations of alleles on a single chromosome, increasing genetic diversity.
Meiosis and fertilisation do not make new alleles; they make new combinations of the alleles already present.
Topics that use new combinations of alleles
- Evolution may lead to speciation (A-level only) (AQA A-Level)
- Genetic diversity can arise as a result of mutation or during (AQA A-Level)
Related terms
- crossing over
- genetic variation
- polyploidy
- random fertilisation
- allele frequency change
- alleles
- allopatric speciation
- causes of change
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