then what blood type is our baby??
2006-12-04 08:33:49 · 11 answers · asked by Crystal M 2 in Science & Mathematics ➔ Biology
The most likely outcomes are A+, A-, O+, and O-. Under very rare situations, other blood types could result as well.
Like most of our other genes, we have two copies of our blood type genes. One gene is called ABO. The other, called RhD, gives the + and the -.
ABO
An A blood type can be either AA or AO (this is because A is dominant over O). The O bloodtype can be only OO.
If the A parent is AA, then all of their children will be A blood type. Why? Because an AA parent can give only an A to their children (parents pass one copy of each of their genes at random to their kids).
So the AA person can only give an A. The OO person can only give an O. So all the kids will be AO or A blood type.
If the A parent is AO, then that parent has a 50% chance of passing down an A and a 50% chance of passing down an O. So each child would have a 50% chance of an A blood type and a 50% chance of an O blood type.
RhD
The RhD gene works similarly. In this case, + is dominant over -. What this means is that someone with a + blood type can be either ++ or +-.
If either parent is ++, then all of their kids will be + as well for the same reasons that I describe for the AA parent. If both parents are +-, then each child has a 25% chance of being Rh-.
The 25% comes from the fact that each parent has a 50% chance to pass down a - gene. When you have two chances like this, you multiply them together and get 25%.
Odds for each possible blood type
I can't really give odds right now because it is very hard to know whether someone is a carrier of O and/or - or not. If either of the parents of the A person has O blood type, then the A person is a carrier for O and is AO. And if either parent is -, then the A person is a carrier for -.
And if either of the parents of the O person is -, then the A person is a carrier for -.
These folks can still be carriers even if their parents are not O or -. How? If their parents are carriers too. This is why without a DNA test (and parents who have the recessive trait), it is very difficult to figure out who is a carrier or not.
2006-12-04 09:02:24 · answer #1 · answered by BS 2 · 0⤊ 0⤋
You have an equal chance of being AA or AO. If you're AO you have an equal chance of passing on the A or the O gene to your baby. Your husband must be OO so he will definitely pass the O gene to the baby. So the baby has a 75% chance to be AO, which is expressed as type A blood, and a 25% chance to be OO, which is type O.
I don't know exactly how Rh factor is inherited, but I'll bet the baby will be Rh positive since both of you are.
2006-12-04 08:43:00 · answer #2 · answered by Amy F 5 · 0⤊ 0⤋
Your baby is either A or O, positive or negative. No way to be sure with just that piece of information. What about your parents' blood type?
"THE CHILD MAY NOT HAVE ANY OF YOU BLOOD GROUP."
Wrong. The baby is either A or O. But it can be negative.
@ Scott
"O is the dominant blood type, and A would be the sub-dominant."
Now that's just stupid. The other way, bro. And "sub-dominant" is recessive.
2006-12-04 08:42:43 · answer #3 · answered by doctorevil64 4 · 0⤊ 0⤋
O is the dominant blood type, and A would be the sub-dominant. It's most likely that your baby will O- blood type, which is good, because that means that he can give blood to anyone!! With you having A+ and your husband having O+, it's likely that if he needed any blood, there would be no problem too!
2006-12-04 08:43:13 · answer #4 · answered by Scott W 3 · 0⤊ 3⤋
You can't know for sure without testing the baby but there is only a 25% chance the baby will be O+
2006-12-04 08:42:07 · answer #5 · answered by goodanswer 2 · 0⤊ 0⤋
It doesn't just depend on you and your husband. The blood type of your great grandma could affect it. But nine times out of ten it will be a positive type.
2006-12-04 08:43:03 · answer #6 · answered by Aaron B 2 · 0⤊ 0⤋
Your blood group is either AA+, Aa+, Ab+, Ao+, and your husbands is either OO+,Oo+,Oa+,Ob+( capital letter denotes dominance and small letter recessive) Your child is therefore likely to be a combination of any of the above. The only likely thing is he/she will be rhesus positive, as for the blood group you must test!
2006-12-04 08:47:47 · answer #7 · answered by levat 2 · 0⤊ 2⤋
Levat is mostly right, but it is still possible for your baby to be rhesus negative. There's a 1 in 4 chance if both you and your husband's rhesus genotype is +/-, rather than +/+.
2006-12-04 11:03:57 · answer #8 · answered by Anonymous · 0⤊ 0⤋
THE BLOOD GROUP DOESN'T WORK LIKE THE AA AS SS SC OR THE SICKLING GROUPINGS. IT CAN SHOCK YOU THAT THE CHILD MAY NOT HAVE ANY OF YOU BLOOD GROUP.
2006-12-04 08:42:24 · answer #9 · answered by Kwadwo B 4 · 0⤊ 3⤋
Could be A+, A-, O+ or O-. Cannot be B+, B-, AB+, or AB-.
2006-12-04 08:42:44 · answer #10 · answered by pluck_tyson 2 · 0⤊ 0⤋