evolution of modern wheat

darwin's finches

african cichlids

grand canyon

hummingbirds in the andes

bering straits land bridge

acqusition of a complete haploid set of another specie's chromosomes

acquisition of a complete haploid set of sepcie's own chromosomes

acquisition of a complete haploid set of another specie's chromosomes

acquisition of a complete haploid set of another specie's chromosomes

prevent hybrid offspring from being fit

block zygote formation

mating or fertilization does not occur or if it does a viable zygote is not produced

cross-fertilization occurs but interspecific hybrid offspring fail to thrive

corss-fertilization occurs but interspecific hybrid offspring fail to thrive

block zygote formation

mating or fertilization does not occur or if it does a viable zygote if not produced

prevent hybrid offspring from being fit

autopolyploidy

barrier to gene flow is physical / geographical

barriers which prevent gene flow are driven by natural selection and non random mating

observed in plants

the 2 populations will be subjected to differences in genetic drift / mutation / natural selection

population diverge and become separate species while occupying distinct ranges

change in chromosome number is an immediate and complete barrier to gene flow

absence of gene flow ensures that related population diverge independently

population diverge while occupying a common range

allopolyploidy

observed in plants

autopolyploidy

barriers which prevent gene flow are driven by natural selection and non random mating

change in chromosome number is an immediate and complete barrier to gene flow

barrier to gene flow is physical / geographical

absence of gene flow ensures that related population diverge independently

the 2 populations will be subjected to differences in genetic drift / mutation / natural selection

population diverge while occupying a common range

allopolyploidy

population diverge and become separate species while occupying distinct ranges

barrier to gene flow is physical / geographical

population diverge while occupying a common range

absence of gene flow ensures that related population diverge independently

the 2 populations will be subjected to differences in genetic drift / mutation / natural selection

allopolyploidy

autopolyploidy

population diverge and become separate species while occupying distinct ranges

change in chromosome number is an immediate and complete barrier to gene flow

barriers which prevent gene flow are driven by natural selection and non random mating

observed in plants

grand canyon

hummingbirds in the andes

african cichlids

evolution of modern wheat

bering straits land bridge

darwin's finches

grand canyon

african cichlids

bering straits land bridge

evolution of modern wheat

humming birds in the andes

darwin's finches