Genetic Frequency & Natural Selection Project
Golden Girls Plus Alex Media Room B Group
Presentation Date: 140523
Presenters:
Alex Bentley
Nancy Bocanegra
Cathy Odom
Christina Sechak
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Species Evolution
Over Many
Generations
1
Project Overview
•
•
What is gene frequency?
How was this proven by the monk Gregor
Mendel through Mendel’s law of segregation?
• What is natural selection?
• What did Charles Darwin learn on the ship
“The Beagle” in the 1830’s?
2
Gene Frequency (Lab #10 with beads)
•
What did we do on Lab#10?
1.
We mixed different selections of beads, red and white, and performed 6
generations of gene mixtures to calculate genotype frequency.
2.
We mixed red, white, and black beads to test genotype frequency.
3.
We used Excel to test out through 12 generations.
Genotype: the entire
set of genes in an
organism; a set of
alleles that
determines the
expression of a
particular
characteristic or trait
Phenotype: the
expression of a
particular trait, like
skin color, height,
behavior, according to
the individual’s
genetic makeup and
environment
3
Natural Selection (Lab#11 with dots)
•
What did we do in Lab#11?
1.
We each placed 20 dots on a patterned mat
2.
Victor, our predator , removed dots to simulate
natural selection
Natural
Selection of the
English
Peppered Moth
in 1800’s
Industrial
Revolution
Victor, the
“Predator”
4
Natural Selection:
Darwinism
Probability
South American Finches
and different beaks on
Galapagos Islands
Chance
Offspring
Darwinism
Nature
Adaption
5
Results: Gene Frequency: two strong genes thrive, survive,
and reproduce, and four die off
120.0%
+100%M 6 Generations and Projections Through 12th Generation
100.0%
80.0%
RR
P
e
r
c
e
n
t
a
g
e
s
60.0%
Rw
ww
RB
40.0%
wB
BB
Linear (RR)
20.0%
Linear (Rw)
Linear (ww)
Linear (RB)
0.0%
Gen 1
Gen 2
Gen 3
Gen 4
Gen 5
Gen 6
Gen 7
Gen 8
Gen 9
Gen 10 Gen 11 Gen 12
Linear (wB)
Linear (BB)
-20.0%
-40.0%
-60.0%
Generations
6
Mendel’s Law of Independent
Assortment
Gregor
Mendel
Dominant
Traits
Recessive
traits
>4
generations
7
Conclusions and Observations
•
•
•
Organisms change with time: EVOLUTION
Thriving = SURVIVING = OFFSPRING
Sexual Selection: MATING
Female peafowl
Male peacock
8
Gene Frequency & Natural
Selection Project
Questions, Comments, Concerns?
Thank you!
Christina, Nancy, Cathy, Alex
9