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Chapter 17 Population Genetics and Evolution (Evolution and the Origin of…
Chapter 17 Population Genetics and Evolution
Speciation
Phyletic speciation
Pollen transfer
Seed dispersal
Vegetative Propagation
Ecology
Divergent speciation
Abiological Reproductive Barriers
Biological Reproductive Barrier
prevents successful gene flow
sympatric speciation
see hummingbirds and bees pg 475
Evolution and the Origin of Life
conversion of one species into more/new species
requires thousands of generations
species today evolved from those in the past
chemosynthesis
A. Oparin 1924
Before Life on Earth
Hot and Rocky
A second atmosphere
Population Genetics
abundance of particular allele increases, decreases or remains the same
crossing over
increases genetic diversity in populations
gene pool
total # of alleles in all the sex cells of all individuals in a population
change in gene pool
mutation
an error during cell division
accidents
genetic drift? ecology
Habitat Destruction
severe drought for plants.
artificial selection
selective breeding
meat, corn are examples
natural selection
the fittest
learned about this in ecology
Darwin
Operates only on the phenotypes of preexisting alleles
Convergent Evolution
unrelated species
evolve to resemble
cacti and euphorbias
