Extra Study CH. 24 (The origin of species) Flashcards

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1
Q

How do new species originate from existing species?

A

-populations of a species is connected by gene flow
-a barrier to gene flow is established
-this population diverges genetically
-the population is reproductively isolated and a new species is formed

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2
Q

the process by which one species splits into two

A

speciation

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3
Q

a group of populations whose members have the potential to interbreed and produce viable, fertile offspring

A

species (biological species concept)

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4
Q

what holds the gene pool of a species together, causing its members to resemble each other more than they resemble members of another species

A

gene flow

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5
Q

the existence of biological factors (barriers) that impede members of two species from interbreeding and producing viable, fertile offspring

A

reproductive isolation

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6
Q

impede mating or hinder fertilization if mating does occur

A

prezygotic barriers

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7
Q

prevent a hybrid zygote from developing into a viable, fertile offspring

A

postzygotic barriers

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8
Q

habitat, temporal, behavioral, mechanical and gametic isolation are all examples of

A

prezygotic barriers

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9
Q

reduced hybrid viability, reduced hybrid fertility and hybrid breakdown are examples of

A

postzygotic barriers

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10
Q

distinguishes a species by body shape and other structural features

A

morphological species concept

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11
Q

defines a species in terms of its ecological niche, the sum of how members of the species interact with nonliving and living parts of their environment

A

ecological species concept

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12
Q

gene flow is interrupted when a population is divided into geographically isolated subpopulations

A

allopatric speciation

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