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Quiz - Ch 13
Terms in this set (37)
Widely accepted phenomena in which all species living today are descendants of ancestral species. Charles Darwin helped in developing this.
On the Origin of Species by Natural Selection
Charles Darwin's book
Descent with modificaiton
Evolution does not lead to
Who posited that we wouldn't be able to live without available resources?
Mechanism by which humans have used gene modification and selective breeding techniques in selecting for traits that are favorable.
A defense mechanism to disguise an animal's appearance, usually to blend in with their surroundings.
A group of interbreeding individuals of the same species living in the same place at the same time.
Diurnal breeding species
Organisms that live and reproduce in times of the day
Nocturnal breeding species
Organisms that live and reproduce in times of the night
All the genes in a population at any one time
A change in the relative frequencies of alleles in a gene pool over many generations.
Evolution at its smallest scale.
Any changes in the nucleotide sequence of DNA.
Mutations are often in the form of this
Within a sexually reproducing, diploid population, allele and genotype frequencies will remain in equilibrium unless outside forces act to change those frequencies.
psquared +2pq+q squared=1.0
What could increase the chances that the allele frequencies will fluctuate by chance?
Individuals moving in or out of populations
This will add or remove alleles in a population.
This can alter or remove alleles from a population altogether.
This can disrupt the Hardy-Weinberg equilibrium by changing the frequencies of homozygous and heterozygous genotypes.
Unequal survival and reproductive success of individuals can alter this and disrupt the Hardy-Weinberg equilibrium.
If the five conditions for the Hardy-Weinberg equilibrium are not met in a population, the populations blank may change.
Differentiation in the allele frequencies making up the gene pool
Natural selection, genetic drift and gene flow
Major causes of evolutionary change by microevolution
What is the only driving force that consistently leads to enhanced reproductive success for a population?
A process in which individuals with certain inherited traits are more likely to survive and reproduce than are individuals that do not have those traits.
An outcome of natural selection that favors intermediate phenotypes, acting against extreme phenotypes.
An outcome of natural selection that acts against individuals at one of the phenotypic extremes.
An outcome of natural selection that favors individuals at both extremes of the phenotypic range.
A form of natural selection in which certain characteristics may enhance reproductive success and the likelihood of passing on more likeable traits to offspring and therefore enhance their ability to obtain mates.
Competition for mates, usually by males.
Involves individuals of one sex, usually females, being choosy in selecting their mates. Females will often select flashy or colorful mates.
A change in the gene pool of a population due to chance events.
This leads to a loss of genetic diversity when a population is drastically reduced.
This happens when a few individuals colonize a new habitat.
The movement of fertile individuals or gametes between populations.