Download Incomplete/ Codominance

Topic:
Name: ____________________________
Date:_________________________
Incomplete/
Codominance
Objective: SWBAT use Mendel’s Principles to understand incomplete
dominance and codominance
Questions/Main Ideas:
What is the Principle of
Dominance?
Principle of Dominance = Some alleles are dominant and some are recessive
for a particular trait.
T
T
- Use the same letters with different cases (Tt)
Ex: Tall and short Pea plants
Result= Tall Pea plants (Tt)
What is incomplete
dominance?
t
t
Result= Pink Snapdragons (RW)
Tt
Tt
W
RW
RW
W
RW
RW
Codominance= situation where both alleles are dominant, so they are both
expressed in the heterozygous offspring.
- Use different letters
Ex: Black and White Chickens
B
B
BW
BW
BW
BW
W
Result= Checkered Chickens (BW)
W
Summary:
Tt
Incomplete Dominance= Situation where one allele is not completely
dominant over another allele for that gene (blend). The heterozygous
phenotype is in between that of the homozygous.
R
R
- Use different letters (RW) or Prime (R1R1)
Ex: Red and White Snapdragons
What is Codominance?
Tt