The correct option is (B) These immigrants provide a source of genetic diversity for the other populations.
Migration is essential for maintaining genetic diversity among populations.
How is genetic diversity impacted by immigration?
- New alleles are introduced to an existing population when new, genetically distinct individuals enter it.
- By generating novel allele combinations through mating, the new organisms increase the genetic diversity of the species as a whole. Increasing heterozygosity and allelic richness, both of which are essential for population persistence, is the main way that immigration benefits populations.
- While allelic richness is directly related to the capacity for adaptation and long-term sustainability of populations, heterozygosity is of immediate consequence to both individual and community fitness.
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