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702 Rep Isolation

honors

TermDefinition
Biological species concept - A population or group of populations whose members have the potential to interbreed and produce viable, fertile offspring
Other species concepts - By these definitions, populations that meet the biological species criteria can still be regarded as different species Ex: two bird populations that could produce fertile offspring but never actually mate can be regarded as different species
Prezygotic barriers - A reproductive barrier that impedes mating between species Includes habitat, temporal, behavioral, mechanical, and gametic isolation
Reproductive barriers - anything that prevents individuals of closely related species from production viable, fertile offspring There are two types, prezygotic and postzygotic
Postzygotic barriers - prevent the hybrid zygote from developing into a viable, fertile adult
Habitat isolation - when closely related species are not separated by physical barriers but occupy different habitats and thus rarely encounter each other
Temporal isolation - when closely related species are not separated by physical barriers but having different breeding times
Behavioral isolation - when closely related species are not separated by physical barriers but have different mating calls or rituals
Mechanical isolation - when closely related species are not separated by physical barriers but have reproductive structures that are physical incompatible Ex: flowers that are pollinated by birds with differently shaped bills
Gametic isolation - when closely related species are not separated by physical barriers but their sperm and egg are not compatible AKA molecular incompatibility Ex: proteins on the membranes of certain sea urchin gametes prevent the male and female gametes from fusing
Hybrid - (In this context) the offspring of two different species
Reduced hybrid viability - when two species can mate and produce hybrid offspring, but those offspring are unlikely to survive
Reduced hybrid fertility - when two species can mate and produce hybrid offspring that can survive, but those offspring are infertile, meaning that cannot produce their own offspring
Hybrid breakdown - when two species can mate and produce hybrid offspring that can survive and are fertile, but subsequent generations of the hybrid are unable to survive
Created by: Mr. Ford
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