1. Patterns of Inheritance

2. Test Cross
A cross between an individual of unknown genotype and an individual that is homozygous recessive .
Can determine the genotype of any individual whose phenotype is dominant.

3. Incomplete Dominance
In an incomplete dominant cross the heterozygous phenotype is an intermediate phenotype between the two homozygous phenotypes.

4. Example of Incomplete Dominance

5. Codominance
. In codominance both alleles are expressed in the heterozygous individual.

6. Examples of Codominance

7. Multiple Alleles
In this form of inheritance there are more than two alleles that result in a certain trait.

8. Multiple Allele Example

9. Multiple Allele Punnett Square
Genotypes Blood Type
IA IA or IAi A
IBIB or IBi B
IAIB AB
ii O

10. Continued
1) Both the father and mother have type O blood. __________ x _________
Phenotypic Ratio: ______________
2) The father is type A homozygous, the mother is type B homozygous.
__________ x _________
Phenotypic Ratio: _____________

11. Sex-Linked Traits AKA—X-linked traits
Traits controlled by genes located on the X chromosome.
Mostly affects males because they only have one X chromosome.

12. Examples of Sex-Linked Traits
Red-Green Colorblindness
Hemophilia