Biology A-Level
Natural selection
What Natural selection means in Biology A-Level, as defined for OCR.
Definition of Natural selection
Check what you remember
Read the wording for your board, then hide it and explain Natural selection in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: OCR
Changes allele frequencies when heritable variation affects survival and reproduction, as individuals with advantageous alleles reproduce more and pass those alleles on.
Topics that use Natural selection
- Patterns of inheritance (OCR A-Level)
Related terms
- Allele frequencies
- Alleles, genotypes and phenotypes
- Autosomal linkage
- Change in allele frequency over generations
- Chi-squared (χ²) test
- continuous variation
- critical value
- Crossing over and independent assortment
Using Natural selection in the exam
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