1. Other types of Inheritance

2. Incomplete Dominance: definition
individuals that are heterozygous are different from either homozygous parent
neither allele is completely dominant, the hybrid offspring have a phenotype that is intermediate between the phenotypes of the parents

3. Incomplete Dominance: example
snapdragon flowers appear red when homozygous RR

4. Incomplete Dominance: example
Snapdragon flowers appear white when homozygous WW

5. Incomplete Dominance: example
A cross between red and white flowers produces pink flowers (a blending of red and white) RW

6. Codominance: definition
neither allele is dominant over the other
both contribute equally to the phenotype of the offspring and heterozygous individuals show both phenotypes

7. Codominance: example
chickens that are homozygous for white colour are WW

8. Codominance: example
Chickens that are homozygous for black colour are BB

9. Codominance: example
Chickens that are heterozygous for colour are BW and appear checkered

10. Multiple alleles: definition
within a population, there may be more than two versions (alleles) of each trait
Each individual can only possess two of these alleles – one on each chromosome

11. Multiple alleles: example
A allele = IA
B allele = IB
O allele = i

12. Multiple alleles: combinations
Genotype Phenotype IAIA type A blood