Mechanism of Evolution 1
A random event that changes populations
What is genetic drift?
Humans breed organisms for traits the humans find desirable
What is artificial selection?
In Australia, ancient marsupials went through a rapid burst of differentiation to fill unique environments, resulting in Koalas, Kangaroos, and other marsupials
What is adaptive radiation?
One species of fireflies mates at night; the other during the day
What is temporal isolation?
An organism with different alleles migrates into a new area
What is gene flow/migration?
Organisms develop traits that increase their likelihood of successful mating and reproduction
Flowers and pollinators evolve to match
What is co-evolution?
An earthquake creates an enormous canyon that splits a squirrel population in two for thousands of years and they slowly become two species
What is geographic isolation?
Random mutations continually add up, the most "fit" are passed on, causing slow evolution of the organism
What is natural selection?
A green bird migrates into an area of yellow birds and many generations later there are green and yellow birds
What is migration/gene flow?
Species evolve similarly due to similar environments but without a common ancestor
What is convergent evolution?
Two species of birds sing completely different mating songs
What is behavioral isolation?
A flood wipes out all but a small handful of salamanders in a meadow. The population recovers, but with much less genetic diversity
What is the founder effect (genetic drift)?
Male lions develop luxurious manes; females choose males with the best manes
What is sexual selection?
Accumulation of differences over time from a common ancestor that leads to different species
One species of flowers pollinates at night; another pollinates during the day
What is temporal isolation?
Wild mustard has been cultivated over thousands of years into cauliflower, broccoli, and kale
What is artificial selection?
A random mutation causes a trait that benefits an organism's survival and reproduction
What is natural selection?
What are two different species?
A horse and a donkey can't produce fertile offspring
What is reproductive isolation? What are two different species?