NEET Biology question
The nurses working in the maternity ward of a hospital suspect that they have accidentally mixed up three babies when tagging them after birth. Blood typing of the three couples and three babies involved was done to match each baby to the right family. The results were:
Baby 1: Type B Baby 2: Type A Baby 3: Type O
Mr Singh: Type O Mrs Singh: Type AB
Mr Sisodia: Type A Mrs Sisodia: Type O
Mr Mehra: Type AB Mrs Mehra: Type B
What can be inferred from the data?
Solution
Applying ABO inheritance rules to each couple: Mr Singh (O = ) × Mrs Singh (AB = , obligately heterozygous) can only have children of type A () or B () — never O or AB. Mr Sisodia (A) × Mrs Sisodia (O = ) can only have children of type A (always possible) or type O (possible only if Mr
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