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

when closely related species are not separated by physical barriers but occupy different habitats and thus rarely encounter each other

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

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

(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

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

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702 Rep Isolation

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Term	Definition
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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