ex:father = ab+
mother = 0+
child = b-
2006-10-22 06:08:20 · 6 answers · asked by ms 1 in Health ➔ Other - Health
Yes, because even though a person has positive blood (it doesn't matter the antigen type), they can pass on a negative gene if they have one of each. If a person has one gene for the Rh factor and one without the Rh factor, that person will have the Rh factor--a positive blood type--but can still pass the gene without the Rh factor to their child.
For example: In your case, you said Dad was AB+ and Mom was O+. A child could be B- if they got the B antigen from Dad and the O from Mom, along with the gene for NO Rh antigen from each parent. In this case it would simply mean both parents were heterozygous for the Rh gene, i.e, they each only had one copy of the gene (which is dominant) and neither of them passed it on to the child.
On paper it would look like this:
Dad is AB+
Mom is O+
Child could have these possibilities:
A+O+ (Expresses A+)
B+O+ (Expresses B+)
A-O- (Expresses A-)
B-O- (Expresses B-)
The only thing the child could not be is Type O, because Dad is AB and these antigens are dominant over O (which really means "no" surface antigens. These are inherited separately from the Rh factor, which is what is denoted by the + or -).
2006-10-22 06:40:07 · answer #1 · answered by medrecgal1973 5 · 1⤊ 0⤋
It is possible for both to be positive and the child to be negative because positive is the dominant allelle. The example you have is totally possible if the father had an AB+- and the mother had OO+-. The father would have had to give B- and the mother O-. The B is dominant over the O, so yeah. It could happen. Genetics is weird sometimes.
2006-10-22 13:16:31 · answer #2 · answered by turdl38 4 · 2⤊ 0⤋
Positive is the dominate = both parents could have negative genes that are dormant. When both sets of dormant genes mixed the parents got a negative child. Basic high school biology
2006-10-22 13:20:15 · answer #3 · answered by Akkita 6 · 0⤊ 0⤋
Yes, it is possible. Happens all the time.
However, if the parents are both negative, it is not possible to have a child with positive blood.
2006-10-22 13:22:09 · answer #4 · answered by Anonymous · 0⤊ 0⤋
yes it is very possible, the parents blood type doesn't have anything to do with the childs blood type.
2006-10-22 13:16:30 · answer #5 · answered by ? 6 · 0⤊ 1⤋
i guess my parents are positive and im negative
blood wize
personality wize they are negative
2006-10-22 13:15:04 · answer #6 · answered by native,pride 5 · 0⤊ 0⤋