Transcript 05Strawfish2007

Natural Selection
of Strawfish
AP Biology
2007-2008
Phenotypes & Genotypes
 Phenotypes are controlled by genotype
AP Biology
Phenotype is Selected
 Natural selection acts on phenotype
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Gene Pool is Affected
 Natural selection changes allele frequency
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Behind the scenes
FISH
ALLELES
B
G
Y
Tot
Gen 1
3
3
3
9
Gen 2
3
3
1
7
What happened
to the frequency
of the yellow allele?
AP Biology
Will yellow fish
be born as often?
Will the yellow allele
disappear?
B
Y
Tot
Gen 1
9
9
18
Gen 2
9
5
14
ALLELE Frequency
B
Y
Tot
Gen 1 .5
.5
1.0
Gen 2 .6
.4
1.0
Any
QUESTIONS??
Is a gene
a fish’s way
of making
more fish?
or…
Is a fish
a gene’s way
of making
more genes?
AP Biology
2007-2008