Darwin
These are the islands off the coast of Equador that inspired much of Darwin's work.
The Galapagos
A population is a group of organisms that have the (potential) to do what?
Interbreed
According to this species concept, species are groups of interbreeding natural populations.
The Biological Species Concept
Most of the body plans of animals that exist today evolved in this geological time period.
Cambrian
This is the ship that Charles Darwin used for his famous trip to the Galapagos.
HMS Beagle
These birds were the basis for Darwin's theory of descent with modification via natural selection.
Galapagos finches.
Evolution is the change is ____ frequencies over time.
allele
This prezygotic isolation mechanism allows copulation (mating) to occur, but not the fusion of egg and sperm.
Gametic
Two taxa that share a common ancestor are said to be ____ groups.
sister
Life first appeared on Earth ___ BYA.
3.6
Darwin published this famous book in 1859.
On the Origin of Species
This occurs when individuals of a population are randomly removed.
Bottleneck effect
This type of speciation mechanism does not require a geographic barrier.
Sympatric Speciation
Mass extinction events are followed by _______ _______.
adaptive radiation
This is the time when "the age of mammals" began.
65.5 MYA; the Cretaceous-Tertiary boundary (i.e. the K-T boundary).
This is the ship Darwin sailed on during his explorations.
HMS Beagle
When many individuals (and their alleles) leave a population the ____ rate is said to be high
emmigration (will accept migration)
Are species real?
Yes
Footprints and burrows are examples of this type of fossil.
Trace
If an allele is lost in a population only ___ or ___ can bring it back
mutation; migration
In order for natural selection to drive evolutionary change what is required?
-variation
-heritable traits
differential reproductive success (i.e. "winners" and "losers" in the mating game; i.e. differences in fitness).
This is the only source of brand new alleles or genes in a population.
Mutation
Speciation is the loss and fixation of what between two isolated populations?
allele frequencies and traits
The flaps of skin that a flying squirrel (a placental mammal) and a sugar glider (marsupial) use to glide are said to be _________ structures.
analogous
Has evolution ever been directly observed?
Yes.