'Isolated populations' diaporamas de présentation

The Origin of Species Chapter 22

The Origin of Species Chapter 22. The concept of species must account for two phenomena: The distinctiveness of species that occur together at a single locality The connection that exists among different populations belonging to the same species. The Nature of Species.

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The Evolution of Populations

The Evolution of Populations. Chapter 11. Genetic Variation in Populations. Microevolution - the observable change in the allele frequencies of a population over time. Occurs on a small scale In populations there are a wide range of phenotypes

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Hardy-Weinberg equilibrium describes populations that are not evolving.

KEY CONCEPT Hardy-Weinberg equilibrium provides a framework for understanding how populations evolve. named after Godfrey Hardy (mathematician at Cambridge) and William Weinberg (German physician) who discovered this mathematical relationship in 1908.

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Hardy-Weinberg equilibrium describes populations that are not evolving .

HMD Bio Chapter 11 Section 4 KEY CONCEPT Hardy-Weinberg equilibrium provides a framework for understanding how populations evolve. Hardy-Weinberg equilibrium describes populations that are not evolving. Biologists use models to study populations.

464 views • 28 slides

Content Standard 6

Content Standard 6. Describe evidence of species variation due to climate, changing landforms, interspecies interaction, and genetic mutation. Eligible Content. Describe evidence of species variation due to climate in the cases of the snowshoe rabbit and arctic fox

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Evolution

Evolution. Macroevolution/Speciation. Macroevolution. Macroevolution is the occurrence of large-scale changes in the characteristics (traits) of life -- in effect, the evolution of species and higher taxa.

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Conservation Genetics

Conservation Genetics. Sam Hopkins Biodiversity and Conservation Biology. An Optional Graphic can go here. What is conservation genetics?. Conservation genetics includes: Study of inbreeding in small populations Study of spatial patterns of genetic variation Study of gene flow

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Conservation Genetics

Conservation Genetics. Sam Hopkins Biodiversity and Conservation Biology. An Optional Graphic can go here. What is conservation genetics?. Conservation genetics includes: Study of inbreeding in small populations Study of spatial patterns of genetic variation Study of gene flow

204 views • 17 slides

Natural Selection, Speciation, and Evolution

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Hardy-Weinberg equilibrium describes populations that are not evolving.

KEY CONCEPT Hardy-Weinberg equilibrium provides a framework for understanding how populations evolve. Hardy-Weinberg equilibrium describes populations that are not evolving. Biologists use models to study populations. Hardy-Weinberg equilibrium is a type of model.

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What is a founder effect? Give examples. Define penetrance, expressivity

What is a founder effect? Give examples. Define penetrance, expressivity. Ana Terron-Kwiatkowski, MRCPath part I course, London 2010. Founder effect, penetrance and expressivity. Founder effect definition Origin and prevalence of common mutations High mutational rate in hot-spots

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Speciation is especially likely in small isolated populations.

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Speciation

Speciation. The formation of a new species. Speciation - occurs in isolated populations. Geographic isolation leads to reproductive isolation Once the population is geographically isolated, they adapt to their unique environment .

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Contentious communities: the Human Genome Diversity Project

Contentious communities: the Human Genome Diversity Project. HI269 Week 23. Comparisons to keep in mind. Anthropometry ? Statistics ?.

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Molecular evolution What is molecular evolution? Mutation, drift and selection acting at the molecular level

Molecular evolution What is molecular evolution? Mutation, drift and selection acting at the molecular level. Change in DNA sequences. ATGGTCAAGCTTACCATG. ATG C TCAAGCTTACCATG. ATGGTCAAGCTTACCATG. ATGGTCAAG A TTACCATG. ATGGTCAAG A TTACC T TG. Molecular evolution

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Georges -Louis Leclerc , Comte de Buffon

Georges -Louis Leclerc , Comte de Buffon. Wrote a set of encyclopedias. Suggested Common Ancestry and an older earth. Suggested changes between isolated populations. Used vestigial organs as evidence that organisms changed over time.

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