X-linked inheritance, simple dominance. Trait carried only on the X chromosome X^2 = red eye color, X’ = white eye color. Red Is dominant to white. Males are XY, females XX. You are sitting at the dinner table and see a male fruit fly hovering over a bowl of oranges happen to notice he has white eyes. Based on this, can you determine what color eyes each parents had? B. A few seconds later you see another male fruit fly, this time with red eyes. Can you determine what color eyes each of his parents had? C. Pretend that eye color is not sex linked, but instead is inherited normally. If you saw a red eyed fruit fly, what could you then say about its parents’ eye color? Codominance, multiple alleles. AB blood groups are codominant with each other and dominant over type O. The Rh factor is a separate gene, and behaves according to simple dominance (+ indicates the presence of the factor). I have a big family – 9 brothers and sisters, and I am the youngest. Gail and Heather are twins. Mom insisted that we all get blood typed in case one of us needed a blood transfusion. Here are the results from our trip to the blood drive center, showing the blood type and the Rh factor (either present or not present: Mom: AB+ B. Can you say based on the blood typing if Gail and Heather are identical twins?