Biology Unit 5 - Evolution 0.0 / 5 ? BiologyEcology, ecosystems and environmental biologyA2/A-levelEdexcel Created by: lauraking20Created on: 11-06-17 10:47 What is evolution? The frequency of an allele in a population changes over time 1 of 11 How does evolution occur> Through natural selection 2 of 11 When does speciation occur? When populations of the same species become reproductively isolated, reducing gene flow 3 of 11 How many reproductive isolation occur? Allopatric or sympatric isolation 4 of 11 Why does reproductive isolation occur? Because the changes in the alleles and phenotypes of the 2 populations prevent them from successfully breeding together 5 of 11 3 types of changes? Seasonal, mechanical, behavioural 6 of 11 Seasonal changes? Individuals from same population develop differing flowering/mating seasons 7 of 11 Mechanical changes? Changes in genitalia that prevent successful mating 8 of 11 Behavioural changes? Develop courtship rituals that aren't attractive to the main population 9 of 11 What does sympatric isolation not require? Geographical isolation 10 of 11 What occurs within a population? Random mutations 11 of 11
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