Geographical Distribution Flashcards
Define a cline
Change in allele frequency over geographical transact. May share alleles
An abrupt change from 1 allele to another with no shared alleles is indicative of ..
A step cline
A smooth cline =
Gradual change
A cline depends on:
Genetic drift and gene flow
Genetic drift is less variation within which…
Is an increased difference between populations
More variation within is gene flow which..
Is a decreased difference between populations
Wider cline =
Greater dispersal
Steeper cline is indicative of
Stronger selection
Products of historical divergence is what concept?
Phylogenetic species concept
Biological species concept is:
Process by which species arose
Where 2 populations have met and are not mixing well, what is produced!”?
Tension zone
Tension zones have a steep cline because …
Heterozygotes are disadvantaged and don’t reproduce as well as homozygotes
2 genetically distinct populations meet and mate
Hybrid zone
Hybrid zones are
Narrow as it prevents the alleles from spreading
Hybrid zone can have 4 outcomes:
Merge
Indefinite
Reproductive isolation
3rd species created
