KCET · BIOLOGY · STD 11 - 15. Body Fluids and Circulation

Select the correct Rh-blood groups of the parents, whose child is affected with erythroblastosis fetalis.

A Both father and mother are Rh+ ve
B Mother is Rh + ve and father is Rh - ve
C Both father and mother are Rh - ve
D Father is Rh + ve and mother is Rh - ve

Verified Solution

Answer & Solution

Correct Answer

(D) Father is Rh + ve and mother is Rh - ve

Step-by-step Solution

Detailed explanation

(D) Father is Rh + ve and mother is Rh - ve,
If the father is Rh+ and mother Rh-, the probability of child being Rh + is more.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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