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chapter 17 (speciation (divergent dpeciation (remainder of species…
chapter 17
speciation
divergent dpeciation
remainder of species continues
new species
evolution of part of species in new
phyletic speciation
one species to new species
original species doesn't exist
allopatric speciation
physically seperated
can not interbreed
2 or more populations
sympatric speciation
biotic reproductive barriers
not by physical differences
limited geographical range
the conversion of one species in to a new species
evolution
change of nucleotide sequence in DNA
natural selection
better adapted
genetic drift
alteration in gene pool by accident
convergent evolution
responding to similar selection pressures
strongly resemble each other
2 phenotypically distinct species
parallel evolution
2 or more groups
similar selective pressures
similar homologous features
features derived from common ancestral feature
selection
artificial selection
alter gene pool
selective breeding
natural selection
preferential survivor
adapted
natural conditions
whose alleles are better for the environment
mechanisms
postzygotic isolation
prevents successful interbreeding of 2 pop
cannot produce fertile adult
prezygotic isolation
prevents successful interbreeding of 2 pop.
act so early, fertilization is not possible
genes
gene flow
movement of alleles in a pop.
gene pool
total pop. of all alleles