As a follow up to my previous blood exploration, a bit on inheriting blood types from one's parents...

Each person receives an A, B, or O gene from each parent. The A and B genes are co-dominant; the O gene is recessive.

A person whose genetic type is

• either AA or AO will have blood type A
• either BB or BO will have blood type B
• type OO will have blood type O

In the Rh system, the positives are dominant over the negatives. If your genetic type is ++ or +-, your blood type will be Rh+. Only if your genetic type is -- will you be Rh-. If both parents are Rh+ with the +- genes, they could have children who are ++, +-, or --.

[source: www.drgreene.com]

The various blood groups are not found in the same proportions around the world:

• "There are some tribes of American Indians in which as many as 98 percent of the people tested are of blood group O. The rest are of blood group A. Other Indian tribes have a great many people of blood group A, some as many as 80 percent of the people. The rest are of blood group O. Few, if any, 'Pureblooded' American Indians, however, are of blood type B or AB."
• "Inhabitants of Asia are more commonly of blood type B than are people who live elsewhere. A group of people in Bengal, India, was tested, and it was found that 4O percent of them were of blood type B. Only 32 percent were of blood type O, and only 2O percent of blood type A. The rest were of blood type AB."
• "The gene frequencies for B are highest in the area .... [including] central Asia, Manchuria, Iran, and northern India."
• "The very low frequency of B in Australia and the Americas applies only to the native population, the Indians and the Aborigines. The Europeans who have emigrated to the Americas and to Australia have the same gene frequencies as their ancestors since they brought the B gene with them."
• "The Inca Indian population was founded by a small number of individuals, all of which had type O blood. Consequently, type O blood to this day is the only blood type in pure Incas."
• "The Dunker (German) community [in] Franklin Co., Pennsylvania has an ABO genotype frequency unlike that of their neighbors or those of their West German origins. This is due to the fact that the community was founded by 50 families (Genetics, Russel, 1996)."

[sources: www.dadamo.com/theory3.htm, www.lander.edu/rsfox]

^ Matthew spent the morning waxing his car and then taking pictures of her.