Formation of species. The process of species formation is called? Speciation Scientists use internal...
-
Upload
leslie-preston -
Category
Documents
-
view
223 -
download
3
Transcript of Formation of species. The process of species formation is called? Speciation Scientists use internal...
![Page 1: Formation of species. The process of species formation is called? Speciation Scientists use internal and external structures and appearances ( morphology.](https://reader035.fdocuments.us/reader035/viewer/2022062321/56649e745503460f94b745aa/html5/thumbnails/1.jpg)
Formation of species
CHAPTER 16 SECTION 3
![Page 2: Formation of species. The process of species formation is called? Speciation Scientists use internal and external structures and appearances ( morphology.](https://reader035.fdocuments.us/reader035/viewer/2022062321/56649e745503460f94b745aa/html5/thumbnails/2.jpg)
The process of species formation is called?
Speciation
Scientists use internal and external structures and appearances ( morphology )as the criteria for classifying a species
This is the morphological species concept
Because morphological characteristics are easy to observe, makes species designations based on morphology becomes convenient
THE CONCEPT OF SPECIES
![Page 3: Formation of species. The process of species formation is called? Speciation Scientists use internal and external structures and appearances ( morphology.](https://reader035.fdocuments.us/reader035/viewer/2022062321/56649e745503460f94b745aa/html5/thumbnails/3.jpg)
This concept states
A species is a population of organisms that can successfully interbreed but cannot breed with other groups
What happens if species reproduce asexually?
How do we define a species that is extinct then?
BIOLOGICAL SPECIES CONCEPT
We have to use both concepts!
![Page 4: Formation of species. The process of species formation is called? Speciation Scientists use internal and external structures and appearances ( morphology.](https://reader035.fdocuments.us/reader035/viewer/2022062321/56649e745503460f94b745aa/html5/thumbnails/4.jpg)
They must be isolated from other species.
2 forms of isolation exist
Geographic Reproductive
HOW DO YOU MAKE A SPECIES?
![Page 5: Formation of species. The process of species formation is called? Speciation Scientists use internal and external structures and appearances ( morphology.](https://reader035.fdocuments.us/reader035/viewer/2022062321/56649e745503460f94b745aa/html5/thumbnails/5.jpg)
The physical separation of members of a population
Can you think of species that are geographically isolated that may have similar species in other areas?
GEOGRAPHIC ISOLATION
![Page 6: Formation of species. The process of species formation is called? Speciation Scientists use internal and external structures and appearances ( morphology.](https://reader035.fdocuments.us/reader035/viewer/2022062321/56649e745503460f94b745aa/html5/thumbnails/6.jpg)
Results from barriers to successfully breeding between population groups in the same areas.
This can occur in two ways; before fertilization and after
REPRODUCTIVE ISOLATION
![Page 7: Formation of species. The process of species formation is called? Speciation Scientists use internal and external structures and appearances ( morphology.](https://reader035.fdocuments.us/reader035/viewer/2022062321/56649e745503460f94b745aa/html5/thumbnails/7.jpg)
Before fertilization occurs when fertilization cannot occur.
Mating calls not recognized by certain frogs, differences in mating periods
REPRODUCTIVE ISOLATION
![Page 8: Formation of species. The process of species formation is called? Speciation Scientists use internal and external structures and appearances ( morphology.](https://reader035.fdocuments.us/reader035/viewer/2022062321/56649e745503460f94b745aa/html5/thumbnails/8.jpg)
After fertilization barriers occur usually with the offspring.
Mostly involve offspring that are sterile
REPRODUCTIVE ISOLATION
![Page 9: Formation of species. The process of species formation is called? Speciation Scientists use internal and external structures and appearances ( morphology.](https://reader035.fdocuments.us/reader035/viewer/2022062321/56649e745503460f94b745aa/html5/thumbnails/9.jpg)
2 different rates
Gradualism Punctuated Equilibrium
RATES OF SPECIATION
Rapid Change
Slow, gradual change
![Page 10: Formation of species. The process of species formation is called? Speciation Scientists use internal and external structures and appearances ( morphology.](https://reader035.fdocuments.us/reader035/viewer/2022062321/56649e745503460f94b745aa/html5/thumbnails/10.jpg)