Evidence for Evolution
A trait that is no longer useful in a specific organism.
What is vestigial?
The exchange of alleles among populations.
What is gene flow?
A group of populations that interbreed and produce fertile offspring.
What is biological species?
Associations of species that live in the same area and interact with one another.
What is community?
A small sample of a larger population establishes a new population.
What is founder effect?
Biological evolution for desired traits caused by humans performing selective breeding.
What is artificial selection?
A population of mammals displays a variety of fur thicknesses. Over time as the climate cools, those individuals with the thickest fur survive better, live long enough to reproduce, and pass on their genes to their offspring. This example illustrates _______ ______.
What is directional selection?
Ecological, behavioral, mechanical, and gametic isolation are types of ______ reproductive barriers that isolate two species in the same geographic region.
What is prezygotic?
The black-billed magpie that feeds on the ticks in the fur coats of American bison is an example of _______.
What is mutualism?
All of the alleles found in all individuals of a species.
What is gene pool?
An organisms from which many species have evolved.
What is common ancestor?
Results in organisms that appear very much alike despite vastly dissimilar genetics.
What is convergent evolution?
The formation of new species in the absence of geographic isolation.
What is sympatric speciation?
Organisms that get energy by eating others below them on a food chain.
What is consumer?
A set of resources a population needs to survive and reproduce.
What is ecological niche?
The humerus bone in a human and the humerus bone in a whale are an example of this type of trait.
What is homologous trait?
A population is reduced to very few individuals and alleles are lost.
What is genetic bottleneck?
The accumulation of differences in the DNA sequences of genes in two or more populations of organisms over time; results in the populations becoming more and more genetically dissimilar.
What is genetic divergence?
A species that has a disproportionately large effect on the community.
What is keystone species?
A killer whale eats a leopard seal that ate a sea bass that ate a krill that ate a phytoplankton. The killer whale is a _________ consumer.
What is quaternary?
Provides evidence of a species with some similarities to the ancestral group and some similarities to the descendant species.
The percentage of a specific allele in a population.
What is allele frequency?
What is coevolution?
Two siblings are fighting over a bag of Halloween candy they are supposed to share. Each child feels that he/she should have the entire bag. At night, both children sneak candy out of the bag and into their rooms without seeing each other do it. If these were two species in a community, ________ competition would be happending.
What is exploitative?
A dark skinned woman living in an area with low UV light levels will have low overall fitness due to inadequate production of _______ _. A light skinned woman living in an area with high UV light levels will have low overall fitness due to decreased levels of _____.
What is vitamin D?
What is folate?