1. LEQ: What is meant by co-dominance, incomplete dominance, multiple alleles, and polygenic traits?
9.12 to 9.16

2. Incomplete Dominance
One allele is not completely dominant over the other
When both alleles are present the phenotype is between the phenotypes of the parental varieties
How can you tell the difference between dominance and incomplete dominance?
Dominance would have 2 phenotypes
Incomplete dominance has 3 phenotypes

3. Incomplete Dominance

4. Neither allele is dominant over the other allele
Co-dominance
When different alleles are present at the same time, both alleles are expressed
Neither allele is dominant over the other allele
Example: Roan Cattle

5. A gene that is controlled by 3 or more alleles
Multiple Alleles
A gene that is controlled by 3 or more alleles

6. Human Blood Typing

7. Pleiotropy
The control of more than one phenotypic characteristic by a single gene

8. Polygenic Inheritance
Traits that are controlled by 2 or more genes
Characterized by having 3 or more phenotypes (a range of phenotypes)

9. Environmental Impact on phenotypic expression
Human – expose to sun, nutrition, exercise
Plant – climate, exposure to sun, water, wind