Extra Study CH. 24 (The origin of species)

Question 1

How do new species originate from existing species?

Answer 1

-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

Question 2

the process by which one species splits into two

Answer 2

speciation

Question 3

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

Answer 3

species (biological species concept)

Question 4

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

Answer 4

gene flow

Question 5

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

Answer 5

reproductive isolation

Question 6

impede mating or hinder fertilization if mating does occur

Answer 6

prezygotic barriers

Question 7

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

Answer 7

postzygotic barriers

Question 8

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

Answer 8

prezygotic barriers

Question 9

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

Answer 9

postzygotic barriers

Question 10

distinguishes a species by body shape and other structural features

Answer 10

morphological species concept

Question 11

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

Answer 11

ecological species concept

Question 12

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

Answer 12

allopatric speciation