Presentation on theme: "Complex Inheritance of Human Traits. Codominance in Humans Phenotypes of both homozygotes are produced in the heterozygote Recall the checkered rooster."— Presentation transcript:
Codominance in Humans Phenotypes of both homozygotes are produced in the heterozygote Recall the checkered rooster Sickle-cell anemia
Sickle-cell Anemia Disorder where red blood cells are sickle shaped Normally concave Shorter life span and can slow bloodflow or block small vessels 1 in 12 African Americans is heterozygous for the disorder
Hemophilia: An X-linked disorder Blood fails to clot normally because of a deficiency or abnormality of one of the clotting factors 1 male in every 10 000 has hemophilia but only about one in 100 million females Why?
Polygenic Inheritance in Humans These kinds of traits usually represent a range of variation that is measurable Color variations in human eyes Skin color