Natural Selection
A characteristic of an animal that helps it survive in its habitat.
What is an adaptation
This evidence shows past animals and how they changed over time.
What is fossil evidence.
Where are older fossils located
at the bottom
When members of a population can no longer interbreed with each other and have acquired differences from each other.
What is speciation
A heritable trait that is beneficial will _________ in number in the population
What is increase
Same structures but different ancestors that show evidence of a common ancestor.
What is homologous structures.
The method of determining the exact age of a rock or fossil
What is radiometric or absolute dating.
When a population is separated by a mountain, river, or valley which prevents breeding.
Geographic Isolation.
100 g start in a sample. the sample is 75 years old and three half lives have passed. How long is the half life?
25 years
This is the ability of an organism to survive and reproduce.
What is fitness
This evidence states that organisms that live in the same area will be more closely related.
What is biogeography.
The amount of time it takes for 50% of a radioactive isotope to decay.
What is a half-life
When species that share a common ancestor gain differences from each other.
Divergent Evolution.
Alleles in a population change due to random chance events.
What is genetic drift.
When one phenotype that was rare becomes more common due to selection pressures in the environment.
What is directional selection
When proteins are compared to determine how related organisms are.
Biochemical or Molecular evidence.
If a half-life of an element is 200 years. The sample is 600 years old. How many half lives have passed.
3 half lives.
When two species look similar in structure or function due to environmental pressures but they do not share a common ancestore.
Convergent evolution.
When a small number of the original population colonize a new area and alleles are not representative of the entire population.
What is the founder effect.
When the average phenotype becomes rare and both extremes become more common.
What is disruptive selection
Embryology provides evidence of this.
What is common ancestry.
The starting sample has 80g of the parent isotope. 3 half lives pass, how much remains?
10g.
One ancestor species rapidly diversifies into many different species.
Adaptive radiation.
Having different breeding seasons keeps species from breeding.
Temporal isolation.