Genetic drift is driven by chance, not natural selection

A forest fire ignites and kills many members of a population of rattlesnakes. This is an example of:

Genetic diversity is increased through:

This image is an example of:

The more genetic variation a population has,

the more likely it is for some individuals to

Mutations are important because they bring about

A trait or change in lifestyle that helps a plant or animal survive in its environment

Genetic drift is change in the allele frequency of a population due to...

This mechanism of evolution occurs when populations immigrate or emmigrate

Male peacocks have beautiful blue and green plumage. However, this coloration makes them easier for tigers to hunt and kill. Why might they have these colors?

Which of the following is an example of the bottleneck effect?

Natural selection operates on the _______ of an individual organism.

The concept of genetic bottlenecks includes which of the following?

Organisms with the best suited adaptations for their environment are more likely to survive and reproduce than organisms that are not very well adapted

Select the right word for this definition:

"in biology, changes that happen over time in the gene pool of a population."

If a new trait DOES help an organism survive, what may happen to it?

Hunters killed elephants with tusks resulting in more tuskless elephants. The hunters were the ___ pressure changing the population

What type of selection is pictured here?

What type of selection is pictured here?

Type of Selective Pressure: A particular bird species lays an average of 4 eggs per nesting season. If more than four eggs are produced, the parents may not be able to feed the hatchlings. If less than 4 eggs are produced, there is an increased risk that predators will take all the young that have been produced.

Type of Selective Pressure: A lizard population lives in a very rocky area consisting of black rocks and white rocks. Black lizards can hide from predators by living on black rocks, and white lizards can hide from predators by living on white rocks. The intermediate grey colored lizard is found in fewer numbers because of its inability to hide from predators in this environment.

Type of Selective Pressure: During the ice ages, the black bears of Europe increased in size.

Type of Selective Pressure: In a population of field mice, coat color ranges from light tan to dark brown. Medium brown mice are found in greater abundance due to their ability to blend in with their surroundings.

Charles Darwin formulated his idea for natural selection after visiting which unique island chain?

Which characteristic of the finches in the Galapagos did Darwin find particularly interesting?

The study of embryo development

A measure of an organism's ability to survive and reproduce

Darwin proposed the idea of ...

Evidence for evolution comes from

The man who also came up with the idea of natural selection, but wasn't given credit since Darwin had more evidence.

This is an example of...

When a species exhibits differences in traits between males and females

The allele for sickle cell anemia has an unusually higher fitness on the continent of ________

Studying the similarities and differences in gene sequences between two species

Which type of selection is this?

Which type of selection may lead to speciation?

The process by which one species may gradually become two

Allele frequencies in populations don't change unless and evolutionary force is acting on them.

Two structures that appear to have the same function but did not arise from common ancestry.

Natural Selection directly acts on...

T/F: Since Darwin first proposed the idea of natural selection and common ancestry, we have discovered more and more evidence that supports his idea from new sources such as comparative genetics, the fossil record, and comparative proteomics.

The study of protein structure

The allele for sickle-cell anemia has a higher fitness in Africa because it provides some resistance to ...

Anatomical structures that have little or no use but are present due to ancestry.

The "A" allele = 40%

The "a" allele = 60%

These are examples of...