Test Bank for Evolution 3rd Edition by
Carl Bergstrom, Lee Alan Dugatkin. Isbn.
9781324033714
what is speciation - answer-the creation of a new speoces
what is the key formation of most new animal species - answer-isolation
what are the two main ways populations get isolated - answer-dispersal and barriers
what is dispersal - answer-the movement of individuals from their birthplace to a new, distant
location where they settle and breed
what are barriers - answer-develops in the middle of a range and separates species
what is the parent population range - answer-new species evolving while living within the same
geographic area as their ancestor
does more change happen in a smaller or bigger population - answer-smaller
what are two examples of barriers - answer-rivers or mountains
what are two examples of artificial barriers - answer-roads and pathways
1
,what is an environmental change that is a barrier - answer-new competitor
what is mumeration - answer-flock of birds swarming
what do barriers have to do with gene flow - answer-the genetics of species are being isolated
meaning the populations will no longer exchange gens leading to no gene flow
what does no genetic introgression mean - answer-there is no movement of genes from
populations into other populations
what is gene flow - answer-the exchange of genes between two populations
what two things will small differences in two environments result in - answer-natural selections
and shifts in allelic frequencies within each population
over time, populations will diverge genetically and may become so different that reproduction
could increase or decrease? - answer-decrease
what could happen if the barrier disappears - answer-gene flow may occur between populations
what will favor the further isolation of populations to preserve the environmental adaption
each population has - answer-natural selection
what does sympatric mean - answer-living in the same place
2
, If two groups of the same species are living in different places and never meet, do they evolve
ways to avoid mating with each other - answer-no
when do mechanisms develop through natural selection - answer-only after the barrier has
fallen
what is allopatric speciation - answer-when a new species forms because a group gets
geographically separated from the rest.
what is sympatric speciation - answer-when a new species forms without being physically
separated
they live in the same area the whole time.
what two things are the most common sympatric organisms - answer-lower verts and plants
what are the four reproductive isolating mechanisms premating - answer-1. ecological
2. temporal
3. ethological isolation
4. mechanical
what are the six reproductive isolating mechanisms postmating - answer-1. gametic mortality
2. zygotic mortality
3. embryonic mortality
4. hybrid inviability
5. hybrid sterility
3
Carl Bergstrom, Lee Alan Dugatkin. Isbn.
9781324033714
what is speciation - answer-the creation of a new speoces
what is the key formation of most new animal species - answer-isolation
what are the two main ways populations get isolated - answer-dispersal and barriers
what is dispersal - answer-the movement of individuals from their birthplace to a new, distant
location where they settle and breed
what are barriers - answer-develops in the middle of a range and separates species
what is the parent population range - answer-new species evolving while living within the same
geographic area as their ancestor
does more change happen in a smaller or bigger population - answer-smaller
what are two examples of barriers - answer-rivers or mountains
what are two examples of artificial barriers - answer-roads and pathways
1
,what is an environmental change that is a barrier - answer-new competitor
what is mumeration - answer-flock of birds swarming
what do barriers have to do with gene flow - answer-the genetics of species are being isolated
meaning the populations will no longer exchange gens leading to no gene flow
what does no genetic introgression mean - answer-there is no movement of genes from
populations into other populations
what is gene flow - answer-the exchange of genes between two populations
what two things will small differences in two environments result in - answer-natural selections
and shifts in allelic frequencies within each population
over time, populations will diverge genetically and may become so different that reproduction
could increase or decrease? - answer-decrease
what could happen if the barrier disappears - answer-gene flow may occur between populations
what will favor the further isolation of populations to preserve the environmental adaption
each population has - answer-natural selection
what does sympatric mean - answer-living in the same place
2
, If two groups of the same species are living in different places and never meet, do they evolve
ways to avoid mating with each other - answer-no
when do mechanisms develop through natural selection - answer-only after the barrier has
fallen
what is allopatric speciation - answer-when a new species forms because a group gets
geographically separated from the rest.
what is sympatric speciation - answer-when a new species forms without being physically
separated
they live in the same area the whole time.
what two things are the most common sympatric organisms - answer-lower verts and plants
what are the four reproductive isolating mechanisms premating - answer-1. ecological
2. temporal
3. ethological isolation
4. mechanical
what are the six reproductive isolating mechanisms postmating - answer-1. gametic mortality
2. zygotic mortality
3. embryonic mortality
4. hybrid inviability
5. hybrid sterility
3
