'Phylogenetic species concept' presentation slideshows

General Biology (Bio107)

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Lecture 13. - September 24, 2008 Speciation. 1. What are species?

Lecture 13. - September 24, 2008 Speciation. 1. What are species? 2. Do species exist, and, if so, what is the evidence? 3. How does speciation occur? a) How does genetic differentiation arise? b) How does reproductive isolation occur?

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Species Diversity

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Molecular Phylogenetics

Molecular Phylogenetics. Dan Graur. Objectives of phylogenetics. Reconstruct the correct genealogical ties among biological entities Estimate the time of divergence between biological entities Chronicle the sequence of events along evolutionary lineages. Molecular phylogenetics.

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Species and Mechanisms of Speciation

Species and Mechanisms of Speciation. I. Species Definitions Species represent the boundary for the spread of alleles and define the unit in which the modes of evolution operate. Biological Species Concept Individuals belong to the same species if they can interbreed with each other

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Chapter 24 The Origin of Species

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Chapter 23 & 24 Population Genetics and Speciation

Chapter 23 & 24 Population Genetics and Speciation. Evolution descent with modification genetic change over time Natural Selection differential reproductive success different phenotypes result from interaction of organisms with environment

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Chapter 7

Chapter 7. Animal Classification, Phylogeny, and Organization. Classification of Organisms. Systematics or taxonomy Study of the kinds and diversity of organisms and of the evolutionary relationships among them. A Taxonomic Hierarchy. Taxon

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PLANT OF THE DAY! Stevia rebaudiana, commonly known as sweetleaf

PLANT OF THE DAY! Stevia rebaudiana, commonly known as sweetleaf Close relative of sunflower native to South America Steviol gylcosides are circa 300x the sweetness of sugar, but no effect on blood glucose. Big Questions.

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The Origin of Species

The Origin of Species. Speciation. Speciation is the process by which one species splits into two or more species Speciation explains the features shared between organisms due to inheritance from their recent common ancestor.

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The Science of Classification

The Science of Classification. Why do we need to be able to identify and classify organisms?. To avoid confusion surrounding common names Eg . Puma, cougar, mountain lion, panther Has more than 40 common names! Only one scientific name: Felis concolor. Not what I mean!.

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NIS - BIOLOGY

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Modern Classification

Modern Classification. 17.2. What is a species. It used to be thought that anything that looked different were considered to be different species. We now know that any given species has variation .

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SPECIES AND SPECIATION

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Advanced Biology Chapter 23 Systematics and Phylogenetic Revolution

Advanced Biology Chapter 23 Systematics and Phylogenetic Revolution. Systematics. Systematics is the study of evolutionary relationships Phylogeny is the study of the patterns of relationships among species. Descent with Modification.

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MODERN CLASSIFICATION

MODERN CLASSIFICATION. Zebra Book Chapter 17 Section 2. Determining Species. Not always easy to define a species Organisms that are one species by a certain definition could be another species by a different definition As knowledge increases, definitions change

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What is a species?

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SPECIES AND SPECIATION

SPECIES AND SPECIATION. What is a species?. Morphological Species Concept Phylogenetic Species Concept Biological Species Concept. Morphological Species Concept. Use physical similarities to classify species. Phylogenetic Species Concept.

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Clicker quiz 2!

Clicker quiz 2!. Have your clickers ready!. 1. When we look at nature, we can see that species are:. Always clearly defined and obvious. Rarely clearly defined and obvious. 30. Countdown. 2. Heterotrophic multicellular organisms with a cell wall are in:. Kingdom Protista

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Quiz 4:

Quiz 4:. The discovery that species evolve and give rise to new species {speciation} radicalized the ages-old conundrum. {discrete categorization of a continuous world} Biologists of Darwin's time were familiar with taxonomic puzzles over whether

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