What is the chance of two parents with blood types ab and o producing an offspring with blood type o

Zero.

Because person with AB blood group will have (I antigen - antigen on RBCs) has Ia and Ib. While person with blood group O will have only i antigen.

Blood group A: Ia + i ; Ia + Ia

Blood group B: Ib + i ; Ib + Ib

Blood group O: i + i

Blood group AB: Ia + Ib

Probabilities in the given case:

Ia + i = Blood group A

Ib + i = Blood group B.

Thus the children would either have Blood group A or B. Never O.

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)

answer; hydrologic cycle;