Question

given that a couple with type a blood and type o blood already have a child with type o blood, construct a punnett square for the cross between the two parents.

Answer 1

Despite the fact that both parents are still blood type A, Dad has the option of passing either the A or the O gene variant.

Mom can also transmit either an A or an O. As a result, you can see that a child has a 1 in 4 probability, or 25% chance, of having blood type O. However, it is theoretically feasible for two O-type parents to have an AB or B blood type child (although this is even more unlikely). In fact, if you take into account the rule-breaking cases, a child can acquire practically any blood type. Having an A parent and a B parent can result in a child with the blood types A, B, AB, or O.

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