The **founder effect** occurs when:
AA natural disaster reduces population size drastically
BA few individuals migrate and establish a new isolated population — its gene pool is a non-representative sample of the original
CMutations increase
DRandom mating prevails
Answer & Solution
Correct answer: B. A few individuals migrate and establish a new isolated population — its gene pool is a non-representative sample of the original
Founder effect = a special case of genetic drift where a small breakaway group establishes a new population. The new gene pool differs (sometimes greatly) from the parent population purely by sampling. Important in island colonisation.
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