Is a type O possible a TEEN with type O blood ?" I think not, because type O is of blood type O. The following diagrams are Punnett squares for. Both the father and mother have type O blood . _____ x _____ Phenotypic Ratio: 2) The father is type A homozygous, the. Blood Type Punnett Square Practice. (Hint: blood type O is recessive). The Punnett square for their offspring is shown to the right. The genotypes of their offspring could be either I A i or I B i. Using punnett squares , determine the possible blood types of the offspring whe. The gene for type O is recessive. Using punnett squares ,. Blood Type (Codominance). From the remaining genes, drag genes into the middle box to make the Punnett square . There should be no genes left over. Let’s try another Punnett square !!! A man who is blood type AB marries a woman who is heterozygous type B . If they had four TEENren,.