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The factor that leads to Founder effect in a population is:
The Founder effect is a direct manifestation of Genetic Drift operating in small colonizing groups! When a tiny fraction of a population migrates to form a new colony, random sampling of alleles drastically shifts gene frequencies. Match Option (4)!
Genetic drift (Sewall Wright effect) refers to the random, non-directional changes in allele frequencies within a gene pool occurring purely due to chance sampling in small populations:
When a small subset of individuals disperses from a large parental population to colonize a previously unoccupied habitat, they serve as the "founders." By chance, the allele frequencies of these founders differ substantially from the parent gene pool.
Over generations, the new colony evolves distinct genotype frequencies, and the original drifted population becomes founders of a distinct lineage or new species. This special case of genetic drift is termed the Founder Effect.
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Natural selection causes directional changes based on differential fitness, whereas Founder effect occurs due to random sampling chance.
Recombination shuffles existing alleles during meiosis without altering overall population allele frequencies in Hardy-Weinberg equilibrium.
Mutation introduces novel alleles at low frequency, but the sampling effect of the colonizers is driven by genetic drift.
Founder effect is an extreme example of genetic drift resulting from random sampling during the founding of a new colony.
Students often think the new colony flourishes because it has "superior survival adaptations" (natural selection). However, the initial difference in allele frequency is purely random and non-adaptive (genetic drift).
"Sometimes the change in allele frequency is so different in the new sample of population that they become a different species; the original drifted population becomes founders and the effect is called founder effect."
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