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Transcript of Evolution:
From reproductive isolation in which two populations mate at different times
Create your own sentence: Think about WHY this is a factor.
The Process of Speciation
Formation of new species
When two different organisms mate. Example: __________
Isolation of species or populations cannot interbreed and produce fertile offspring
Create your own sentence: Think - why can
some organisms NOT produce offspring?
Two populations having differences in courtship rituals or other types of behavior that prevent them from mating.
Create your own sentence: Think of two types of organisms that attract their mate differently.
Form of reproductive isolation in which two populations are separated by geographic forms such as rivers, mountains, or stretches of land.
Create your own sentence: Think about a geographic form that would prevent organisms from reproducing.
Objective for 4-7-2014
Students will be able to compare and contrast the four types of isolation and give an example of each.
Question of the Day:
What could cause genetic drifting to occur?
A. Speciation: formation of new species.
B. Isolating Mechanisms- As new species evolve, populations become reproductively isolated from each other
a. Reproductive Isolation: when the members of two populations cannot interbreed and produce fertile offspring
b. Behavioral Isolation: when two populations are capable of inter-breeding but have differences in courtship rituals or other types of behavior
c. Geographic Isolation: when two populations are separated by geographic barriers such as rivers, mountains, or bodies of water
d. Temporal Isolation: when two or more species reproduce at different times
C. Speciation occurs by 5 main steps
a. Founding a New Population
i.A few finches travel from South America to one of the islands to survive and reproduce
b. Geographic Isolation
i. Some birds from species A cross to a second island
ii. The two populations no longer share a gene pool
c. Changes in a Gene Pool
i. Seed sizes on the second island favor birds with larger beaks
ii. The population evolves into population B with larger beaks
d. Reproductive Isolation
i. If a few population B birds cross back to the first island, they will not mate with the birds of population A
ii. The gene pools are now separate
iii. Populations A and B are separate species
e. Ecological Competition
i. A new species C may evolve from changes in A or B
ii. Some members of the original species B may travel to a new island
7 Minute Wrap Up
Name the 4 types of isolation. Give an example of each.
CHECKING FOR UNDERSTANDING
WHAT ARE THE 4 ISOLATION MECHANISMS?
CHECKING FOR UNDERSTANDING
WHAT ARE THE FIVE STEPS IN SPECIATION?