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Q95 (CAPF/2011) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Genetics and evolution Answer Verified

Father and mother having A and B blood group respectively

Result
Your answer: —  Â·  Correct: C
Explanation

The ABO blood group system is determined by three alleles: A, B, and O. Alleles A and B are codominant, while O is recessive [t2]. A person with blood group A can have the genotype AA or AO, and a person with blood group B can have the genotype BB or BO [t2]. If both parents are heterozygous (genotypes AO and BO), they each contribute one allele to their offspring [c3]. In this scenario, there is a 25% chance the child inherits the O allele from both parents, resulting in an OO genotype, which expresses as blood group O [t1][t2]. Therefore, parents with A and B blood groups can indeed give birth to a child with blood group O [t1]. Options 1 and 2 are incorrect because AB and O are both possible outcomes. Option 4 is incorrect as twins can share any blood group possible for that parental combination.

Sources

  1. [1] Science , class X (NCERT 2025 ed.) > Chapter 8: Heredity > 8.2.2 Rules for the Inheritance of Traits – Mendel's Contributions > p. 129
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SIMILAR QUESTIONS

IAS · 1994 · Q102 Relevance score: 5.03

If father has blood group A and mother has blood group O, then which one of the following blood group may be found in their son ?

NDA-I · 2009 · Q1 Relevance score: 3.61

Which one of the following are the possible blood groups of the offspring of the parents with blood group 0 and AB?

CDS-II · 2014 · Q12 Relevance score: 2.56

Which of the statements given below are correct ? 1. A person having blood group ‘A’ can donate blood to persons having blood group ‘A’ and blood group ‘AB 2. A person having blood group ‘AB’ can donate blood to persons having blood groups ‘A1, ‘B’, ‘AB’ or ‘O’. 3. A person with blood group ‘O’ can donate blood to persons having any blood group. 4. A person with blood group ‘O’ can receive blood from the person of any of the blood groups. Select the correct answer using the code given below:

CDS-I · 2013 · Q60 Relevance score: 2.14

Which one among the fallowing Statements about blood trans- fusion is correct ? Blood group B can give blood to—