Darwin's Theory
What do we call change over time?
Evolution
Homologous structures that have lost much of their original size and function are called _.
Vestigial Structures
All of the genes present in a population make up a _____ _____.
Gene pool
When two populations no longer interbreed due to differences in courtship rituals or other behaviors, _________ isolation can occur.
Behavioral
_______ is a system of naming and classifying organisms based on shared characteristics.
Taxonomy
Preserved remains or traces of ancient organisms are called _.
Fossils
Similar structures that are shared by related species and have been inherited from a common ancestor are called _.
Homologous Structures
The number of times an allele occurs in a gene pool is called the _______ __________.
Allele Frequency
When two populations are separated by geographic barriers such as rivers, mountains, or bodies of water, _______ isolation can occur.
Geographic
What two taxa make up a scientific name?
Genus and species
Any heritable characteristic that increases an organism's ability to survive and reproduce is called an _.
Adaptation
Body parts that serve the same function but not the same structure nor a common ancestor are called _.
Analogous structures
When phenotypes at both the upper and lower ends of the curve have higher fitness than individuals near the middle, ______ selection can occur.
Disruptive
When two or more species reproduce at different times, _______ isolation can occur.
Temporal
Name the three domains
How well an organism can survive and reproduce in its environment is known as _.
Fitness
_ fossils are important evidence of evolution for showing how organisms changed over time.
Intermediate
Genetic drift
When females select mates based on size, strength, or coloration this is called __________ _________.
Sexual Selection
Darwin suggested that evolution proceeded slowly and steadily, an idea called ______.
Gradualism
What is a mechanism of evolution by which organisms most suited for their local environment survive and leave more offspring?
Natural Selection
The Endosymbiotic Theory
A change in allele frequency following a dramatic reduction in the size of a population is called the __________ effect.
Bottleneck
The movement of genes into or out of a population is called ______ ______.
Gene Flow