Chapter 17.3 (p.414-416) Speciation.

Slides:



Advertisements
Similar presentations
KEY CONCEPT New species can arise when populations are isolated.
Advertisements

Chapter 17.3 (Pgs ): The Process of Speciation
THE ORIGIN OF SPECIES CHAPTER 24.
Formation of Species A species is a population of organisms that can successfully interbreed but cannot breed with other groups. Existing species are changed.
Evolution – Formation of New Species What is a species? Biological species concept - groups of interbreeding natural populations that are reproductively.
What is a species?  group of individual organisms that are capable of interbreeding to produce fertile offspring in nature. Male (Purple) and female.
Chapter 24 Notes The Origin of Species. There is more to evolution than just explaining how adaptations evolve in a population. Evolution must also explain.
Speciation. Biological Species Concept Population that can interbreed to produce viable and fertile offspring.
The Process of Speciation
Copyright © 2009 Pearson Education, Inc. The origin of species is the source of biological diversity Speciation is the emergence of new species Every time.
Process of Evolution Chapter 18 Mader: Biology 8th Ed.
Population GENETICS.
Evolution as Genetic Change and Speciation. A Population’s Gene Pool A gene pool is all the alleles available in all of the individuals in a population.
Evolution
Speciation Defined: evolution of new species from an existing species Species: group of organisms that can interbreed and produce fertile offspring.
MECHANISMS OF EVOLUTION. POPULATIONS, NOT INDIVIDUALS, EVOLVE An organism cannot change its phenotype. A phenotype can become more predominant in a population,
Speciation Defined: evolution of new species from an existing species Species: group of organisms that can interbreed and produce fertile offspring.
Chapter 14: The origin of Species
Chapter 17 Population Genetics and Speciation. Population genetics – the study of the frequency and interaction of alleles and genes in populations. *Microevolution.
Population Genetics  Population genetics refers to the study of the numbers and interaction of alleles within a population.  From this, phenotypic variation.
Chapter 16 Section 3 The Process of Speciation AZ State Science Standards S4C4PO1: Identify the following components of natural selection, which can lead.
The Chapter 22 Homework is due on Tuesday, March 10 at 11:59 pm. There will be a quiz over Chapter 22 and the journal article Call Duration as an Indicator.
Chapter 17: Evolution of Populations Section 17-3: The Process of Speciation.
ORIGIN OF SPECIES CH 24. Speciation: origin of new species Microevolution: changes in allele frequencies Macroevolution: changes that result in formation.
How many species of spiders do you see?. Vocabulary so we are all on the same page… Species: group of organisms that breed with one another and produce.
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.
1.C.2 Reproductive Isolation Speciation may occur when two populations become reproductively isolated from each other.
Chapter 24.  Evolution leads to potential speciation  One species becoming two or more species  Speciation leads to macroevolution  Broad changes.
Name Date Period Chapter 16 Evolution of Population s Take notes here Summary – one summary at the end Questions “Cornell Style”
Macroevolution & Speciation
Evolution of Populations
Evolution Practice Test
Speciation Chapter 14 March 2014.
Ch. 14 The Origin of Species
Speciation Geographic isolation of populations
Do Now Explain the difference between directional and disruptive selection. Directional – one extreme of the variation of the trait is most fit Disruptive.
Evolution and Zygotic Barriers (Part 5)
Speciation.
KEY CONCEPT New species can arise when populations are isolated.
AP Biology Chapter 24 The Origin of Species.
Why different species? Why are there 4,740 species of frogs in the world instead of 1 frog??
Evolution and Zygotic Barriers
How do we create new species? How do old species become extinct?
Speciation.
MT: Evolution Speciation and Reproductive Isolation
KEY CONCEPT New species can arise when populations are isolated.
Evolution and Speciation
Making a species through evolution
Speciation… How new species form!.
SPECIATION pp
Speciation.
KEY CONCEPT New species can arise when populations are isolated.
Migration The movement of individuals into, out of or between populations. This movement will permanently change the gene pool and is not just done for.
The Origin of Species Chapter 24.
Chapter 24 Notes The Origin of Species.
Speciation Pt 2 There are different kinds of isolation that can lead to speciation; some are prezygotic and some are postzygotic. mechanical isolation:
Natural Selection Natural selection: organisms with favorable traits for a particular environment survive, reproduce, and pass these traits on to the next.
Speciation.
24.2 Speciation can take place with or without Geographic Isolation
KEY CONCEPT New species can arise when populations are isolated.
Speciation Chapter 24.
Genetic Drift Random changes in allele frequencies that occur in a population. Occurs in small populations with more frequency than in large populations.
Mechanisms of evolution
Lecture #11 Date ________
Speciation.
KEY CONCEPT New species can arise when populations are isolated.
KEY CONCEPT New species can arise when populations are isolated.
Speciation: The Origin of New Species
KEY CONCEPT New species can arise when populations are isolated.
Gene flow is the movement of traits between populations.
Presentation transcript:

Chapter 17.3 (p.414-416) Speciation

Species A group of organisms that: Breed with one another Produce fertile offspring

Speciation Begins When… Reproductive isolation occurs. Gene flow between populations stops. Different environmental pressures exist.

Genetic Variation Confers reproductive success in different environments. Each environment selects for different variations.

Barriers to Reproduction Geographic Behavioral Reduced hybrid viability

Additional Barriers The longer populations remain reproductively isolated from one another the more genetic differences will accumulate, leading to additional reproductive barriers. Temporal Mechanical Offspring sterility Gametic

Feedback: Privacy Policy Feedback
Do Not Sell My Personal Information
About project: SlidePlayer Terms of Service

© 2024 SlidePlayer.com Inc. All rights reserved.