Concept 1
True or False: Genetic Drift increases variation
FALSE
forming of a new species by evolution from pre-existing species.
speciation
Give me an example of evidence of paleontology
Fossils
The process of biological change in populations over time that makes descendants genetically different from their ancestors
EVOLUTION
List one of the 5 conditions that must be met for evolution not to occur
•No mutations
•No natural selection
•LARGE population
•No migration
•Random mating
Organisms that live in similar environments, such as the ocean, often have similar adaptations. This is often due to which type of evolution? (convergent, divergent, extinction, or speciation)
Convergent Evolution
____________________ structures are a result of divergent evolution
homologous
Small scale evolution affecting a single population
MICROEVOLUTION
the movement of genes into or out of a population, affecting the variation within the population is _____________________. Does this increase or decrease variation?
gene flow; increase
In order for a new species to form, _________________ must occur.
isolation
Ostriches have wings but can’t fly! Their wings are an example of a ____________ structure.
vestigial
A measure of how well an organism can survive in its environment
FITNESS
Genes for traits that help an organism be more successful reproductively can be expected to
A. cause it to evolve into a new species. B. become more common in the future.
C. cause the extinction of the species.
D. eventually be eliminated by natural selection.
B. Become more common in the future
Which pattern of evolution results in one species splitting into many over time? (divergent, convergent, coevolution, extinction, or speciation?)
divergent evolution
____________________ structures are a result of convergent evolution. Give an example.
Analagous; insects and owls both have wings, but they are not related.
The combined alleles of all individuals in a population
GENE POOL
List one of the three factors that contributes to variation
•Random mutations
(Ultimate source because the others don’t affect asexual reproducers)
•Genetic recombination during meiosis
•Migration/gene flow
Give me an example of sexual selection
colorful male birds
________________, or nonfunctional genes, provide evidence of biochemistry.
Pseudogenes
Mechanism of evolution that favors traits that potentially decrease survival, but increase likelihood of reproduction
SEXUAL SELECTION