A man with AB blood group and marries a woman with O blood group. Work out all the possible of the progeny.what do u call this pattern of inheritance?

ABO blood group system has three alleles, A, B and O. Any person have two alleles of these three in any combinations. Note that A or B trumps O.

So, A blood group can be AO or AA; B -- BO or BB; AB -- AB; O -- OO

Now to your question. AB marries O group. That is, ABxOO.

Crossing, we get, AO and BO. That is A or B blood group only.