the process of microevolution selection: directional, stabilizing, and disruptive selection...
TRANSCRIPT
The Process of Microevolution
Selection: Directional, Stabilizing, and Disruptive Selection
Microevolution vs. MacroevolutionMicroevolution: change in allele frequencyMacroevolution: formation of new species
Microevolution
The environment selects the best traits in the form of alleles that are advantageous for the given conditionsi.e. the ability to digest a new food, or a new skin pigment may allow an organism to blend in with its environmentGenotype = genetic make-up, what alleles an organism hasPhenotype = appearance, what it looks like
Examples of Microevolution
Case 1: English Pepper MothCase 2: Mystery Predator
The common denominator in each of these cases is the change in the alleles of a given gene or set of genes
If there is a change in the frequency of the allele(s), then there will be a change in the genotype and phenotype of the population
Before industrial revolution After industrial revolution
English Peppered Moth
M and M’s in the wild
The “M and M” Predator
• Showing effects of different M & M colors surviving over time
Your turn!Be the chocolate predator…
• Empty M and M bag on table.
• Place colors on matching dots.
• Place colors that don’t match (green) wherever you have space.
• Now, EAT your M and M prey that don’t match (easiest to find)
M and M Population-Before Predation
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Type of M and M
Num
ber o
f Ind
ivid
ual M
and
M's
1st Bag Blue 1st Bag Red 1st Bag Yellow 1st Bag Green 1st Bag Orange 1st Bag Brow n
M and M's After Predation
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Color of M and M
Nu
mb
er o
f M
an
d M
's
Blue After Red After Yellow After Green After Orange After Brow n After
M and M Population-After Predation
Microevolution effects on populations over time
Life history patterns = how species reproduce
How successful each of the variations in species will be at reproducing
Which M and M’s color will likely have a frequency change?
Poor M & Ms!