Enduring Understanding 1A Change in genetic makeup of a population over time is evolution Essential...
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![Page 1: Enduring Understanding 1A Change in genetic makeup of a population over time is evolution Essential Knowledge 1.A.3 Evolutionary change is also driven.](https://reader036.fdocuments.in/reader036/viewer/2022062511/55163800550346c6758b505d/html5/thumbnails/1.jpg)
Enduring Understanding 1AChange in genetic makeup of a
population over time is evolution
Essential Knowledge 1.A.3Evolutionary change is also driven by random processes.
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Genetic drift is a nonselective process occurring in small populations.Can result in population bottlenecks when a stressful factor such as disease, starvation, or drought kills a great many individuals and eliminates some alleles from a population. This greatly reduces genetic variation.
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Founder EffectOccurs when a few individuals colonize a distant locality and start a new population. They carry only a small sample of the parent population’s genetic variation.
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Reduction of genetic variation within a given population can increase the differences between populations of the same species.
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Essential knowledge 1.A.4Biological evolution is supported by scientific evidence from many disciplines, including mathematics.Scientific evidence of biological evolution uses information from geographical, geological, physical, chemical and mathematical applications.
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Molecular, morphological and genetic information of existing and extinct organisms add to our understanding of evolution.Fossils can be dated by a variety of methods that provide evidence for evolution. These include the age of the rocks where a fossil is found, the rate of decay of isotopes including carbon-14, the relationships within phylogenetic trees, and the mathematical calculations that take into account information from chemical properties and/or geographical data.
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Morphological homologies represent features shred by common ancestry.
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Vestigial structures are remnants of functional structures, which can be compared to fossils and provide evidence for evolution.
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Biochemical and genetic similariteis, in particular DNA nucleotide and protein sequences, provide evidence for evolution and ancestry.
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Mathematical models and simulations can be used to illustrate and support evolutionary concepts.