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Explain how TWO processes that affect the gene pool of populations can lead to evolution - HSC - SSCE Biology - Question 29 - 2020 - Paper 1
Question 29
Explain how TWO processes that affect the gene pool of populations can lead to evolution. A gene pool is the total genetic diversity of a population – it results in... show full transcript
Worked Solution & Example Answer:Explain how TWO processes that affect the gene pool of populations can lead to evolution - HSC - SSCE Biology - Question 29 - 2020 - Paper 1
Step 1
Explain gene flow
Answer
Gene flow involves the transfer of alleles between populations through mechanisms such as migration. When individuals from one population migrate to another and breed, they introduce new alleles to the gene pool, altering allele frequencies. This can enhance genetic diversity and may lead to the adaptation of the population to new environments.
Step 2
Explain genetic drift
Answer
Genetic drift refers to random changes in allele frequencies within a population due to chance events. This is particularly significant in small populations where random events can have a larger impact. For example, if a particular allele becomes more prevalent simply by chance, it can lead to evolutionary changes over time, potentially reducing genetic variation and affecting the population's ability to adapt.