Key Vocabulary
The difference in the physical traits of an individual from those of other individuals in the group in which it belongs.
What is variation?
Darwin proposed natural selection as a ________ for evolution
What is mechanism?
_______ is the movement of alleles from one population to another.
What is gene flow?
A random change in the DNA of an organism is known as _________.
What is a mutation?
_____ are traces of an organism that lived in the past?
What are fossils?
A feature that allows an organism to better survive and reproduce in its environment.
What is adaptation?
Genetic variation is stored in a population’s ___________
What is gene pool?
The change in allele frequency due to chance is known as __________.
What is genetic drift?
New allele combinations are formed in offspring as a result of ________.
What is recombination?
_______ is the study of the distribution of organisms around the world.
What is biogeography?
The process of biological change by which descendants come to differ from their ancestors.
What is evolution?
_______ is a measure of how common a certain allele is in the population.
What is allele frequency?
The two process through which genetic drift can occur are _______ & _________.
What is bottleneck effect & founder effect?
What result does genetic drift have on a population?
What is loss of genetic variation?
______ is referred to when describing the similarities between the embryos of organisms.
What is developmental similarities?
A mechanism by which individuals that have inherited beneficial adaptations show differential reproductive success.
What is natural selection?
Natural Selection can change the distribution of a trait along one of three paths: directional, stabilizing, or ____________.
What is a disruptive selection?
The rise of two or more species from one existing species is called _______.
What is speciation?
______ is genetic drift that occurs after an event greatly reduces the size of a population.
What is the bottleneck effect?
_______ are features that are similar in structure but appear in different organisms and have different functions.
What are homologous structures?
A measure of the ability to survive and produce more offspring relative to other members of the population in a given environment.
What is fitness?
_________, ________, ________ & ________ are the four main principals of natural selection.
What is variation, overproduction, adaptation & decent with modification.
What is Sexual Selection?
______ is genetic drift that occurs after a small number of individuals colonize a new area.
What is founder effect?
_______ are structures that perform similar functions but are not similar in origin.
What are analogous structures?