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Cootie Genetics
Cootie from the East Cootie from the West
Red R Blue r
Wide Ear W Bow w
Purple eye P Lashes p
Lips L Tongue l
Boots B Feet b
Cootie Traits
What does it all mean
• Trend—30:10 ratio of traits from the east versus traits from the west—or 3:1 ratio of dominant to recessive phenotypes
• Trend—10:10:10:10 ratio of trait factors RR, Rr, rR, rr—or 1:1:1:1 ratio. • Rr and rR are the same thing– 1:2:1
ratio of Homozygous dominant (RR) to Heterozygous (rR & rR) to Homozygous recessive (rr) genotypes
Punnett Square for the Homozygous Cooties—first
generation matingR
r
Cootie from the East
Cootiefrom the west
R
RR
R R
r r
rrr
Punnett Square for the Heterozygous Cooties—second
generation matingR
r
First Generation Offspring
First
Gen
erat
ion
Offsp
ring
R RR r
r
r
R
r R r