hi there my dad is o+ my mums rh negative and my blood group is A+. I always thought u had to have same blood

Question

thankyou very much

Answer 1

You don't have to show the same blood type necessarily. Blood type is inherited like most other traits, you get one allele from mom and one allele from dad. except in the case of bllod there are three alleles for blood: A, B and O. A and B are codominant and O is recessive (which means in order to show O type you must have two O alleles). So if your dad is O (OO), and your mom is AA or AO, you could be AO or OO. If your dad is OO and your mom is BB or BO, then you could be BO,or OO. If your mom is AB and your dad is OO, then you could be AO or BO.
As you can see there are quite a few combinations, so this explains why you may show a different type from your dad.
Rhesus factor (the + or -) is a different heritable trait and much simpler. You are either positive or negative. Hope this helps.

For further reading check out
http://www.purchon.com/biology/abo.htm

Answer 2

You have two sets of genes for blood; everyone does. O blood is considered 'recessive' and you only have O type blood if both your mother and father do. (So both of your father's grandparents have type O, and theirs, and theirs, all the way back.) Your mother has either AA or AO blood. Since you have A blood, you know that you have AO, and you got the A from your mother. Since O is 'recessive', it will not be expressed and you functionally have A blood.

On the other hand, the rh factor is dominant (the opposite of recessive - if you get one copy you will express it.) Your dad is OO+ and your mum is A-. She passed you an A- and he passed you an O+. Since rh + is dominant, the rh factor + exists in your blood. Based on the way blood type works, you really did express 'halfway' between the two blood types. You have one copy of an A- gene and one O+ gene, giving you A+ blood. (AO type.)

Since you have AO type, your kids could possibly have type O blood if you met someone else like yourself, someone with BO blood, or someone with OO blood.

(Oh, and AB means one A and one B and they 'co-express.' So if you did have kids with someone who was BO you could have kids that were AO (A), BO (B), AB or O!)

Answer 3

Your mother may be A-, but you could have received the A from your mother and the positive from your father

Answer 4

no only ur parents dominant blood type is shown, you can recieve their negative but it is pretty rare