chapter 24 the origin of species. microevolution (you will remember from chapter 23) is … chapter...
TRANSCRIPT
![Page 1: Chapter 24 The Origin of Species. Microevolution (you will remember from chapter 23) is … Chapter 24 The Origin of Species](https://reader035.vdocument.in/reader035/viewer/2022062408/56649ee75503460f94bf84c1/html5/thumbnails/1.jpg)
Chapter 24The Origin of Species
![Page 2: Chapter 24 The Origin of Species. Microevolution (you will remember from chapter 23) is … Chapter 24 The Origin of Species](https://reader035.vdocument.in/reader035/viewer/2022062408/56649ee75503460f94bf84c1/html5/thumbnails/2.jpg)
Microevolution (you will remember from chapter 23) is …
Chapter 24The Origin of Species
![Page 3: Chapter 24 The Origin of Species. Microevolution (you will remember from chapter 23) is … Chapter 24 The Origin of Species](https://reader035.vdocument.in/reader035/viewer/2022062408/56649ee75503460f94bf84c1/html5/thumbnails/3.jpg)
Microevolution (you will remember from chapter 23) is the generation-to-generation change in allele frequencies within a species
Chapter 24The Origin of Species
![Page 4: Chapter 24 The Origin of Species. Microevolution (you will remember from chapter 23) is … Chapter 24 The Origin of Species](https://reader035.vdocument.in/reader035/viewer/2022062408/56649ee75503460f94bf84c1/html5/thumbnails/4.jpg)
Microevolution (you will remember from chapter 23) is the generation-to-generation change in allele frequencies within a species.
Macroevolution (on the other hand) is the origin of new species.
Chapter 24The Origin of Species
![Page 5: Chapter 24 The Origin of Species. Microevolution (you will remember from chapter 23) is … Chapter 24 The Origin of Species](https://reader035.vdocument.in/reader035/viewer/2022062408/56649ee75503460f94bf84c1/html5/thumbnails/5.jpg)
Macroevolution happens two ways:
Chapter 24The Origin of Species
![Page 6: Chapter 24 The Origin of Species. Microevolution (you will remember from chapter 23) is … Chapter 24 The Origin of Species](https://reader035.vdocument.in/reader035/viewer/2022062408/56649ee75503460f94bf84c1/html5/thumbnails/6.jpg)
Macroevolution happens two ways:
Anagenesis – linear evolution
Cladagenesis – branching evolution
Chapter 24The Origin of Species
![Page 7: Chapter 24 The Origin of Species. Microevolution (you will remember from chapter 23) is … Chapter 24 The Origin of Species](https://reader035.vdocument.in/reader035/viewer/2022062408/56649ee75503460f94bf84c1/html5/thumbnails/7.jpg)
Macroevolution happens two ways:
Anagenesis – linear evolution
Cladagenesis – branching evolution
Chapter 24The Origin of Species
![Page 8: Chapter 24 The Origin of Species. Microevolution (you will remember from chapter 23) is … Chapter 24 The Origin of Species](https://reader035.vdocument.in/reader035/viewer/2022062408/56649ee75503460f94bf84c1/html5/thumbnails/8.jpg)
Macroevolution happens two ways:
Anagenesis – linear evolution
Cladagenesis – branching evolution
Chapter 24The Origin of Species
![Page 9: Chapter 24 The Origin of Species. Microevolution (you will remember from chapter 23) is … Chapter 24 The Origin of Species](https://reader035.vdocument.in/reader035/viewer/2022062408/56649ee75503460f94bf84c1/html5/thumbnails/9.jpg)
What is a species?
Chapter 24The Origin of Species
![Page 10: Chapter 24 The Origin of Species. Microevolution (you will remember from chapter 23) is … Chapter 24 The Origin of Species](https://reader035.vdocument.in/reader035/viewer/2022062408/56649ee75503460f94bf84c1/html5/thumbnails/10.jpg)
What is a species?Reproductive isolation based on prezygotic and postzygotic barriers.
Chapter 24The Origin of Species
![Page 11: Chapter 24 The Origin of Species. Microevolution (you will remember from chapter 23) is … Chapter 24 The Origin of Species](https://reader035.vdocument.in/reader035/viewer/2022062408/56649ee75503460f94bf84c1/html5/thumbnails/11.jpg)
•Habitats
•Mating behaviors
•Mating seasons
•Mechanical incompatibility
•Gamete incompatibility.
Chapter 24The Origin of Species
Prezygotic barriers:
![Page 12: Chapter 24 The Origin of Species. Microevolution (you will remember from chapter 23) is … Chapter 24 The Origin of Species](https://reader035.vdocument.in/reader035/viewer/2022062408/56649ee75503460f94bf84c1/html5/thumbnails/12.jpg)
•Embryo is inviable
•Offspring do not survive to adulthood
•Offspring are infertile.
Chapter 24The Origin of Species
Postzygotic barriers:
![Page 13: Chapter 24 The Origin of Species. Microevolution (you will remember from chapter 23) is … Chapter 24 The Origin of Species](https://reader035.vdocument.in/reader035/viewer/2022062408/56649ee75503460f94bf84c1/html5/thumbnails/13.jpg)
Species concept does not apply to:
Chapter 24The Origin of Species
![Page 14: Chapter 24 The Origin of Species. Microevolution (you will remember from chapter 23) is … Chapter 24 The Origin of Species](https://reader035.vdocument.in/reader035/viewer/2022062408/56649ee75503460f94bf84c1/html5/thumbnails/14.jpg)
Species concept does not apply to:•Fossils
•Asexual reproduction.
Chapter 24The Origin of Species
![Page 15: Chapter 24 The Origin of Species. Microevolution (you will remember from chapter 23) is … Chapter 24 The Origin of Species](https://reader035.vdocument.in/reader035/viewer/2022062408/56649ee75503460f94bf84c1/html5/thumbnails/15.jpg)
Other proposed definitions of species:
Chapter 24The Origin of Species
![Page 16: Chapter 24 The Origin of Species. Microevolution (you will remember from chapter 23) is … Chapter 24 The Origin of Species](https://reader035.vdocument.in/reader035/viewer/2022062408/56649ee75503460f94bf84c1/html5/thumbnails/16.jpg)
Other proposed definitions of species:•Ecological
•Morphological
•Pluralistic
•Genealogical.
Chapter 24The Origin of Species
![Page 17: Chapter 24 The Origin of Species. Microevolution (you will remember from chapter 23) is … Chapter 24 The Origin of Species](https://reader035.vdocument.in/reader035/viewer/2022062408/56649ee75503460f94bf84c1/html5/thumbnails/17.jpg)
SpeciationAllopatric –
Sympatric –
Chapter 24The Origin of Species
![Page 18: Chapter 24 The Origin of Species. Microevolution (you will remember from chapter 23) is … Chapter 24 The Origin of Species](https://reader035.vdocument.in/reader035/viewer/2022062408/56649ee75503460f94bf84c1/html5/thumbnails/18.jpg)
SpeciationAllopatric – Geographic barriers divide a population
Sympatric –
Chapter 24The Origin of Species
![Page 19: Chapter 24 The Origin of Species. Microevolution (you will remember from chapter 23) is … Chapter 24 The Origin of Species](https://reader035.vdocument.in/reader035/viewer/2022062408/56649ee75503460f94bf84c1/html5/thumbnails/19.jpg)
SpeciationAllopatric – Geographic barriers divide a population
Sympatric – New species develop in the midst of parent species.
Chapter 24The Origin of Species
![Page 20: Chapter 24 The Origin of Species. Microevolution (you will remember from chapter 23) is … Chapter 24 The Origin of Species](https://reader035.vdocument.in/reader035/viewer/2022062408/56649ee75503460f94bf84c1/html5/thumbnails/20.jpg)
Causes of sympatric speciation:
Chapter 24The Origin of Species
![Page 21: Chapter 24 The Origin of Species. Microevolution (you will remember from chapter 23) is … Chapter 24 The Origin of Species](https://reader035.vdocument.in/reader035/viewer/2022062408/56649ee75503460f94bf84c1/html5/thumbnails/21.jpg)
Causes of sympatric speciation:
•Polyploidy (mostly in plants)
•Host switching (in parasites)
•Nonrandom mating (in polymorphic populations).
Chapter 24The Origin of Species
![Page 22: Chapter 24 The Origin of Species. Microevolution (you will remember from chapter 23) is … Chapter 24 The Origin of Species](https://reader035.vdocument.in/reader035/viewer/2022062408/56649ee75503460f94bf84c1/html5/thumbnails/22.jpg)
Punctuated equilibriumSpecies change quickly as they bud off from parent species, then change relatively little for the rest of their existence.
Chapter 24The Origin of Species
![Page 23: Chapter 24 The Origin of Species. Microevolution (you will remember from chapter 23) is … Chapter 24 The Origin of Species](https://reader035.vdocument.in/reader035/viewer/2022062408/56649ee75503460f94bf84c1/html5/thumbnails/23.jpg)
Evolutionary Novelties
Chapter 24The Origin of Species
![Page 24: Chapter 24 The Origin of Species. Microevolution (you will remember from chapter 23) is … Chapter 24 The Origin of Species](https://reader035.vdocument.in/reader035/viewer/2022062408/56649ee75503460f94bf84c1/html5/thumbnails/24.jpg)
Evolutionary Novelties•Modifications of older structures
Chapter 24The Origin of Species
![Page 25: Chapter 24 The Origin of Species. Microevolution (you will remember from chapter 23) is … Chapter 24 The Origin of Species](https://reader035.vdocument.in/reader035/viewer/2022062408/56649ee75503460f94bf84c1/html5/thumbnails/25.jpg)
Evolutionary Novelties•Modifications of older structures
•Functions may change or may stay the same.
Chapter 24The Origin of Species
![Page 26: Chapter 24 The Origin of Species. Microevolution (you will remember from chapter 23) is … Chapter 24 The Origin of Species](https://reader035.vdocument.in/reader035/viewer/2022062408/56649ee75503460f94bf84c1/html5/thumbnails/26.jpg)
“Evo-Devo”
Chapter 24The Origin of Species
![Page 27: Chapter 24 The Origin of Species. Microevolution (you will remember from chapter 23) is … Chapter 24 The Origin of Species](https://reader035.vdocument.in/reader035/viewer/2022062408/56649ee75503460f94bf84c1/html5/thumbnails/27.jpg)
“Evo-Devo”Genes that control development play a major role in evolution.
Chapter 24The Origin of Species
![Page 28: Chapter 24 The Origin of Species. Microevolution (you will remember from chapter 23) is … Chapter 24 The Origin of Species](https://reader035.vdocument.in/reader035/viewer/2022062408/56649ee75503460f94bf84c1/html5/thumbnails/28.jpg)
“Evo-Devo”
Chapter 24The Origin of Species
![Page 29: Chapter 24 The Origin of Species. Microevolution (you will remember from chapter 23) is … Chapter 24 The Origin of Species](https://reader035.vdocument.in/reader035/viewer/2022062408/56649ee75503460f94bf84c1/html5/thumbnails/29.jpg)
“Evo-Devo”
Chapter 24The Origin of Species
![Page 30: Chapter 24 The Origin of Species. Microevolution (you will remember from chapter 23) is … Chapter 24 The Origin of Species](https://reader035.vdocument.in/reader035/viewer/2022062408/56649ee75503460f94bf84c1/html5/thumbnails/30.jpg)
A trend is not a goal.
Chapter 24The Origin of Species
Evolution is not goal oriented.
![Page 31: Chapter 24 The Origin of Species. Microevolution (you will remember from chapter 23) is … Chapter 24 The Origin of Species](https://reader035.vdocument.in/reader035/viewer/2022062408/56649ee75503460f94bf84c1/html5/thumbnails/31.jpg)
A trend is not a goal.
Chapter 24The Origin of Species
Evolution is not goal oriented.
.