Natural Selection and Evolution

Which of these is an example of natural selection?

• The largest animal in a population will have more opportunities for reproduction.
• Several species of organisms work together so that they all succeed.
• One species takes all the resources in an environment leaving none for others.
• Organism that are best suited to an environment tend to survive and reproduce more often.

Definition: fitness

• ability to survive and reproduce in a specific environment
• organisms with traits well suited to their environment survive and reproduce at a greater rate
• a growing population causes a scarcity of resources
• differences in the DNA sequence

Lots of offspring and limited resources causes competition for those resources.

• Overproduction of offspring

• Natural selection

• variation

• adaptation

A slight difference in an inherited trait between individual members of the same species.

• variations
• adapatations
• homologous structures
• analogous structures

An inherited trait that helps those organisms that have it to survive

• niche
• structure
• characteristic
• adaptation

The climate of a certain area is cold, and snow is found on the ground most of the year. Equal numbers of two populations of rabbits are introduced into this climate by a group of scientists. One of the populations is brown and the other is white. Predict what will happen over several generations.

• There will be equal numbers of brown and white rabbits
• There will be more brown rabbits that white rabbits
• There will be more white rabbits than brown rabbits
• There is no way to predict what will happen to the rabbit population

A random and permanent change to a gene

• Protein

• Gene

• Natural Selection

• Mutation

The combined genetic information of all memebers of a particular population forms a:

• gene pool

• allele frequency

• phenotype

• population

What is genetic drift?

• the changes in allele frequencies (genes) ,in a population, happening due to random events/circumstances.

• It is an example of primary succession

• Genetic drift are different organisms in a population due to inherited traits from their parents

• It is part of symbiotic relationships such as mutualism, commensalism, parasitism

This mechanism of evolution occurs when populations migrate.

• Extinction
• Gene flow
• Genetic drift
• Natural Selection