Lamarck proposed that changes in an environment caused an organism’s behavior to change, leading to use or disuse of a structure or organ.
Variation
Overproduction
Adaptation
Descent with modification
What type of reproductive isolation is this?
Squirrel population split by Colorado River 10,000 years ago.
What type of Genetic Drift is this?
The serve over hunting of northern elephant seals for their blubber to be use in lamp oil greatly depleted the species’ numbers and genetic variation.
Bottleneck Effect.
Genetic drift is a way by which allele frequencies can change due to chance.
What type of reproductive isolation is this?
Meadowlarks singing different songs to attract mates; courtship (dating)
What was one theory of how the dinosaurs died off. Also what is it called when a catastrophic event such as an ice age or asteroid impact happens and wipes out a large amount of the population.
Mass Extinction
What type of effect is this?
The Amish community is genetically isolated because few outsiders join the population and Amish usually do not reproduce outside of the community therefore polydactyly is much more frequent in Amish communities than in others.
The Founder Effect.
A gene pool is the combined alleles of all the members in a population.