Speciation Ch 14. What is a species Numerous definitions Biological Species Concept Morphological Species Concept Ecological Species Concept Phylogenic.

Slides:



Advertisements
Similar presentations
Origin of Species Galapagos Tortoise.
Advertisements

THE ORIGIN OF SPECIES CHAPTER 24.
POPULATIONS GENETICS. Population genetics A theory of evolution that incorporates genetics into Darwin’s model. Genetic changes within a population: microevolution.
Speciation Ch 14. What is a species Numerous definitions Biological Species Concept Morphological Species Concept Ecological Species Concept Phylogenic.
Population Change n Speciation is the outcome of isolation and divergence. Isolation is created by reductions in gene flow. Divergence is created when.
THE ORIGIN OF SPECIES. HOW DOES EVOLUTION LEAD TO THE FORMATION OF ALL THE DIFFERENT ORGANISMS, OR SPECIES, WE SEE ON THE PLANET? FIRST WE MUST DEFINE.
Origin of Species The term species refers to individuals in a population that are free to breed and that produce viable offspring, without outside intervention,
Origin of Species The term species refers to individuals in a population that are free to breed and that produce viable offspring, without outside intervention,
Chapter 24 The Origin of Species. Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Speciation = origin of new species.
Copyright © 2009 Pearson Education, Inc. The origin of species is the source of biological diversity Speciation is the emergence of new species Every time.
The Formation of New Species. Isolation of Subpops  Mechanisms of evolution cause isolated subpops to diverge.
Outstanding Origin of Species Ch 24. Vocabulary  1. Macroevolution – origin of new taxonomic groups (new species, genera, families etc)  2. Speciation.
Ch 24 – Origin of Species. Overview: The “Mystery of Mysteries” Overview: The “Mystery of Mysteries” Darwin explored the Galápagos Islands Darwin explored.
Copyright © 2009 Pearson Education, Inc. PowerPoint Lectures for Biology: Concepts & Connections, Sixth Edition Campbell, Reece, Taylor, Simon, and Dickey.
Chapter 14 The Origin of Species Lecture by Joan Sharp.
Speciation Until recently, over 500 species of cichlid fishes lived in East Africa’s Lake Victoria Copyright © 2009 Pearson Education, Inc.
CHAPTER 24 THE ORIGIN OF SPECIES 1.
Chapter 24 The Origin of Species. Question? u What is a species? u Comment - Evolution theory must also explain how species originate. u Darwin’s “Mystery.
Chapter 24 The Origin of Species. Question? u What is a species? u Comment - Evolution theory must also explain how species originate.
Chapter 24: The Origin of species -Macroevolution = the origin of new taxonomic groups - Speciation = origin of new species - Anagenesis vs. Cladogenesis.
The Origin of Species Chapter 24. Basics Speciation Macroevolution Two basic patterns of evolution:  Anagenesis  Cladogenesis.
Chapter 14: The origin of Species
Chapter 14- Origin of Species Adaptive radiation Allopatric speciation Behavioral isolation Biological species concept Ecological species concept Gametic.
Objective: Speciation Do Now: Why is this population of horses considered to be the same species?
 Until recently, over 500 species of cichlid fishes lived in East Africa’s Lake Victoria –Where did these species come from? –Why are they disappearing?
The Origin of Species Chapter 24 The Species Problem Modes of Speciation The Tempo of Speciation GradualismPunctuated Equilibrium Morphological Ecological.
Chapter 14 : The Origin of Species Evolution is the source of biological diversity Most changes are minor.
THE ORIGIN OF SPECIES Chapter 24.
ORIGIN OF SPECIES CH 24. Speciation: origin of new species Microevolution: changes in allele frequencies Macroevolution: changes that result in formation.
The Origin of Species. Species Biological Species.
The Origin of Species Chapter 24 Bozeman Tutorial: SpeciationBozeman Tutorial: Speciation (11:39)
The Origin of Species. Species Biological Species.
Speciation. Learning objective SWBAT: Describe and identify the various types of reproductive isolation necessary for the formation of new species according.
Chapter 24 The Origin of Species. Speciation – The process whereby members of one species become another species – A species can evolve through time without.
Speciation & Rates of Evolution AP Biology Unit 4.
The Origin of Species Chapter 24 Biology – Campbell Reece.
Copyright © 2007 by Allyn and Bacon Origin of species II. Speciation allopatric sympatric polyploidy habitat differentiation sexual selection I.Biological.
The Origin of Species What is a Species? Modes of Speciation Origin of Evolutionary Novelty.
Speciation. What is a species? Biological species concept – a population or group of populations whose members have the potential to interbreed in nature.
14.1 to The biological species concept states that a species is a group of populations whose members have the potential to interbreed in nature.
Chapter 24 Edited Lecture
Chapter 24.  Evolution leads to potential speciation  One species becoming two or more species  Speciation leads to macroevolution  Broad changes.
Chapter 24 The Origin of Species.
The Origen of Species Ch 24.
The Origin of Species.
SPECIATION UNIT 5 EVOLUTION.
Speciation Chapter 14 March 2014.
The Origin of Species Chapter 24.
Ch. 14 The Origin of Species
Ch. 21 Warm-Up Use the following information to help you answer the question below: Population = 1000 people AA = 160 Aa = 480 aa = 360 What are the genotypic.
Evolution and Zygotic Barriers (Part 5)
Topics Macroevolution Definitions/concepts of species
1.7: Speciation and extinction have occurred throughout the Earth’s history. 1. SPECIATION CONCEPTS.
Chapter 22 The Origin of Species.
Chapter 24 ~ The Origin of Species
Chapter 24: The Origin of Species
Evolution and Zygotic Barriers
Reproductive Barriers
HW 6 due Thursday 03/29 Answer all warmup questions
CHAPTER 24 THE ORIGIN OF SPECIES.
Ch. 21 Warm-Up Use the following information to help you answer the question below: Population = 1000 people AA = 160 Aa = 480 aa = 360 What are the genotypic.
Chapter 22 Bozeman Tutorial: Speciation (11:39)
SPECIATION pp
The Origin of Species Chapter 24.
Ch. 23 Warm-Up Use the following information to help you answer the question below: Population = 1000 people AA = 160 Aa = 480 aa = 360 What are the genotypic.
Chapter 24 The Origin of Species.
Chapter 24 The Origin of Species.
Speciation Chapter 24.
Chapter 24: The Origin of Species
Chapter 24 The Origin of Species
Presentation transcript:

Speciation Ch 14

What is a species Numerous definitions Biological Species Concept Morphological Species Concept Ecological Species Concept Phylogenic Species Concept

Evolutionary Theories

Creating a Species Reproductive Isolation Reproductive Barriers – Prezygotic Barriers – Postzygotic Barriers

Prezygotic Barriers Temporal Isolation Habitat Isolation Behavioral Isolation Mechanical Isolation Gametic Isolation

Postzygotic Barriers Reduced Hybrid Viability Reduced Hybrid Fertality Hybrid Breakdown

Speciation Emergence of a new species Allopatric vs Sympatric – Creation of reproductive barriers

Parent species 2n = 6 Tetraploid cells 4n = 12 1 Diploid gametes 2n = 6 2 Viable, fertile tetraploid species 4n = 12 Self- fertilization 3 Sympatric Speciation Niche separation, sexual selection, habitat differentiation Polyploid

Sympatric Speciation Hybrid Polypoid Species A 2n = 4 Gamete n = Species B 2n = 6 Gamete n = 3 Sterile hybrid n = 5 Chromosomes not homologous (cannot pair) Viable, fertile hybrid species 2n = 10 3

Hybrid Zones Regions where different species meet and mate Outcomes – Reinforcement – Fusion – Stability

Adaptive Radiation Evolution of diverse species from common ancestor Colonization Extinctions

8jc 8jc 0L4