Under what condition does natural selection occur?
Individuals with different heritable phenotypes differ in survival or reproductive success.
AQA A-Level Biology - (7402) · 3.7.3
Revise AQA A-Level Biology - (7402) specification point 3.7.3, Evolution may lead to speciation (A-level only), with free active-recall flashcards. Flip through the set or review every question and answer below.
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Under what condition does natural selection occur?
Individuals with different heritable phenotypes differ in survival or reproductive success.
How can selection pressures such as predation, disease and competition affect phenotypes?
They can favour phenotypes that provide an advantage in the prevailing conditions.
How are favourable alleles passed on through natural selection?
Individuals with advantageous phenotypes are more likely to reproduce and pass their favourable alleles to offspring.
How can natural selection cause evolution over generations?
Favourable alleles can increase in frequency in the population’s gene pool.
What is evolution?
A change in allele frequencies in a population over time.