Can someone tell me how is blood type determined? ?
A person’s blood type is determined largely by genetics, and does not change through his or her lifetime. Human blood types are categorized by the presence or absence of proteins in the cells. The combination of these proteins determines your blood type. The most common form of blood typing is the use of the ABO blood grouping system. This system separates the blood types of humans into four categories: A, B, AB or O. A child receives separate sources of genetic code called alleles from each parent at the time of conception. One of the alleles located on chromosome 9 contains the precise blood type of the donor parent, and is classified as A, B, AB or O. An additional factor is called the Rhesus factor, which could be positive or negative. The actual blood type of a child is determined by the dominant blood type between the two parents.
