'Speciation' diaporamas de présentation

Systematics

Systematics. Discovering and classifying organisms or Study of biodiversity. Taxonomy = discovery and description of species. 2. Phylogenetics = study of evolutionary relationships among species. A B C. Species.

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Evolution

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Welcome to Analysis/ fractionation and speciation of water samples

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Truckee River Water Quality Standards Review

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Chapter 16

POPULATION GENETICS AND SPECIATION. Chapter 16. Population Genetics. The study of evolution from a genetic point of view. Microevolution. A change in the collective genetic material of a population.

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EVOLUTION & SPECIATION

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Not Necessarily on Purpose: Domestication and Speciation in the Canidae Family

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Major Trends in Evolution

Major Trends in Evolution. Microevolution . Small changes over time in the allele frequencies within a species which could eventually lead to speciation Micro = Small. Macroevolution . Large scale evolutionary changes that separate genera, families, orders, classes and even phyla of organisms

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Sketch t he diagram below. It represents a structure found

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Mechanisms of Evolution and Their Effects on Populations Part 2

Mechanisms of Evolution and Their Effects on Populations Part 2. SBI3U Evolution - 8. Factors That Cause Evolutionary Change. Mutations Gene Flow (migration) Non-random Mating Genetic Drift Natural Selection. Natural Selection. Populations have a wide range of phenotypes and genotypes

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Natural Selection

Natural Selection. Developed by Charles Darwin in 1859 Mechanism by which better adapted organisms survive to produce a greater number of viable offspring Improve chances of survival Variation Individuals in a population vary in phenotype which also means their genotype

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CHAPTER 24 THE ORIGIN OF SPECIES

CHAPTER 24 THE ORIGIN OF SPECIES. Section A: What Is a Species?. 1. The biological species concept emphasizes reproductive isolation 2. Prezygotic and postzygotic barriers isolate the gene pools of biological species 3. The biological species concept has some major limitations

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Lesson Overview

Lesson Overview. 17.3 The Process of Speciation. THINK ABOUT IT. Factors such as natural selection and genetic drift can change the relative frequencies of alleles in a population, but this alone does not lead to development of a new species. How does one species become two?.

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Biology DAC Review

Biology DAC Review. Use this review to prepare yourself for the upcoming District Assessment. Evolution and Natural Selection. Why is Geographic Isolation so important to the process of natural selection? Explain the process of Speciation What does it mean to have a common ancestor?

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The Evolution of Populations & Speciation

The Evolution of Populations & Speciation. Chapter 16. Genetic Equilibrium. Population Genetics: the study of evolution from a genetic viewpoint Most popltns have variation amongst their traits i.e. different heights, skin color, etc. If graphed, looks like a bell.

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Evolution Notes

CP Biology Ms. Morrison. Evolution Notes. Genes and Variation. Gene pool = combined genetic information of all members of a particular population Relative frequency = number of times allele occurs in a gene pool (usually %) 2 main sources of genetic variation:

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Cladograms

Cladograms. One way to classify is by Phylogenetic Classification . Phylogeny shows the evolutionary history of species Model Cladogram: model of the phylogeny of a species.

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SPECIATION

SPECIATION. SPECIATION. SPECIATION: Formation of new species SPECIES: Group of similar organisms that can breed & produce fertile offspring. SPECIATION. REPRODUCTIVE ISOLATION: When members of 2 populations cannot interbreed to produce fertile offspring. SPECIATION.

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Species and Speciation

Species and Speciation. - The process by which species are formed. - Depends on groups within a population becoming isolated in some way. Allopatric Speciation. 2 Main Forms of Isolation. Sympatric Speciation. ~ The result of 2 populations becoming geographically isolated.

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