Oo 75

I was just wondering if both parents are B+ will their daughter also will have a B+ blood type?

That is not always the case.

If both parents are B+, this means that their genotype could be:
BO or BB.
And since they are Rh+, their genotype may be:
RR or Rr/rR.

If both of them are BO, their kids have the following possible genotypes:
BB, BO, BO and OO. (75% B and 25% O)
But if one's a BO while the other is a homozygous BB then the possibilities are BB and BO in the ratio of 1:1. meaning a 100% B offspring.

The same theory applies for the rhesus factor.

To know if the parents are homozygous or heterozygous, trying looking at the blood types of the other children, the parent's parents and their siblings.

For example: *real life by the way*
My dad's a B+ while my mum's an O+. How do i find out if my dad's a BO or a BB since both possibilites are equally valid?
If my dad was a BB and my mum an OO(which is the only possible genotype for an O+ person) then all of their kids would be BOs meaning 100% B+ offsprings.

I'm a B+ but my sis is an O+. this can only mean that my dad must be a BO and not a BB. (or that my sis was adopted, which is not true.)

genetics in action. cool isnt it?

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