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SPECIATION or the magical mystery amusing creation of new sp

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Jenna Barbary

on 20 March 2017

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Transcript of SPECIATION or the magical mystery amusing creation of new sp

SPECIATION or the magical mystery amusing creation of new species
Mechanisms of Speciation
Tempo of Speciation
Biological Species Concept
A "species" is a group of populations whose members have the potential to interbreed with one another in nature to produce fertile offspring

Reproductive Barriers between species
What keeps closely related species from interbreeding?
Post-zygotic Barriers
Operate if interspecies mating actually occurs and results in hybrid zygotes
The formation of a new species - when one species evolves into two or more species
Allopatric Speciation
The initial block to gene flow is a geographic barrier that physically isolates the splinter population
Sympatric Speciation
origin of a new species without geographic isolation! HOW?
And puppies! I promise! And cool human evolution stuff!
get on my level.
What is the difference between microevolution and macroevolution?

What is the biological definition of a species?

How do species become separate and stay separate?

What is the tempo of speciation?
What is a Species?
MACROEVOLUTION: Major changes in the history of life - usually evident in the fossil record
origin of a new species
origin of evolutionary novelty
explosive diversification
mass extinction/ adaptive radiation
In this prezi, we will explore how a new species arises. We will look at the origin of evolutionary novelty, explosive diversification and mass extinctions later.
This can only be applied to groups that reproduce sexually
Cannot be applied to fossil record
Other approaches to the definition of "species"...
classification based on measurable physical traits
identification in terms of ecological niches and adaptations
identification of shared common ancestors
Look at how cute this freakin otter is!
reproductive barrier - anything that prevents individuals of closely related species from interbreeding - isolate gene pools of species
Pre-zygotic Barriers: prevent mating or fertilization between species
exploiting a food resource in different habitats
sexual selection
large-scale genetic changes
More info on pg. 270-277!!!
Full transcript