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NEET BIOLOGYMedium

As per ABO blood grouping system, the blood group of father is B+, mother is A+ and child is O+. Their respective genotype can be

A

A.

B

B. I^B i, I^A i

C

C. I^B I^B, I^A I^A

D

D. I^B i, I^A I^A

Step-by-Step Solution

, the ABO blood grouping is controlled by the gene I, which has three alleles: and . alleles and are dominant over .

  1. Child's Genotype: The child has blood group O, which is a recessive trait. This is only possible if the genotype is homozygous recessive (ii). The child must inherit one allele from each parent .
  2. Parents' Genotypes:
  • The father is blood group B. To pass on an allele, he must be heterozygous ().
  • The mother is blood group A. To pass on an allele, she must be heterozygous ().
  • If either parent were homozygous dominant ( or ), all offspring would receive a dominant allele, making blood group O impossible . Therefore, the respective genotypes are and .
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