I'm wondering if it is genetically possible.
2007-02-03 11:50:36 · 5 answers · asked by yoshi2919 2 in Science & Mathematics ➔ Biology
The letters are symbols for specific antigens in blood. These are passed down from parents. There are 3 alleles for these antigens, A, B, and O (Alleles are variations of certain genes)
Each person has two alleles for each gene, they get one from each parent.
Now O is the recessive allele, it means that there are no antigens of that type in the blood (there are other types of antigens, such as the Rh factor)
So a person with Blood Type O would have to have O for both alleles
A person with blood type A would have either an A allele and an O allele, or two A alleles.
A person with blood type AB has an A allele and a B allele.
Each parent gives one allele to his/her child.
So if the parents are A and AB, then:
The A parent could either be AA or AO
and the AB parent is (obviously) AB
So their kid would be
AO, AA, AB, or BO (all the possible combiniations of their alleles)
In every case, the recessive O allele is overshadowed by an A or a B, both of which code for antigens, so the kid couldn't be OO (the genotype necessary for O blood).
2007-02-03 12:36:55 · answer #1 · answered by branzillie 2 · 1⤊ 0⤋
If a woman has a negative Rh factor, and the man has a positive one, she may get pregnant with a Rh positive baby. In that case, her body may attack that of the baby. However, it's really not that common. This is something that your doctor will check for during your first few visits, through your blood work. So, it's really not something that you have to worry about right away. If this is the case, you would receive a shot, preventing your body from making antibodies against the Rh factor. That shot isn't even given until about 28 weeks, and then within 72 hours of birth, so don't worry.
2016-05-24 00:51:39 · answer #2 · answered by Anonymous · 0⤊ 0⤋
no. The ab parent will donate an a or b. so the child will be aa, ab, or ao (if the a parent has ao, not possible if the other parent is aa)
2007-02-03 11:53:43 · answer #3 · answered by ALM 6 · 1⤊ 0⤋
No... The child takes the letters from one parent and the symbol from another... For instance... My mother is AB+ and my father is O-... I am O+... My brother is AB-
2007-02-03 11:56:44 · answer #4 · answered by Sandy 2 · 0⤊ 2⤋
impossible. sorry for the short answer, but this event couldn't happen.
2007-02-03 12:01:46 · answer #5 · answered by barrbou214 6 · 1⤊ 0⤋