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Home › Biology › Genetics - Blood Group Inheritance

Genetics - Blood Group Inheritance — Biology Questions & Practice

Practise 44 Genetics - Blood Group Inheritance questions from Biology for competitive exams such as UPSC, Banking, SSC and Railway. Read the worked questions below, check every answer with an explanation, and track what you get wrong.

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Practice questions on Genetics - Blood Group Inheritance — with answers

Try each question first, then open the answer. Explanations are included.

1. A father has blood group genotype IAIA (phenotype A) and a mother has blood group genotype IAIA (phenotype A). What blood group will ALL of their children definitely have?

  1. AA
  2. BB
  3. CAB
  4. DO
Show answer

Answer: A

Crossing IAIA x IAIA always produces allele combinations that give blood group A, regardless of which allele each parent passes on.

2. A father has blood group genotype IAIA (phenotype A) and a mother has blood group genotype IAIO (phenotype A). What blood group will ALL of their children definitely have?

  1. AA
  2. BB
  3. CAB
  4. DO
Show answer

Answer: A

Crossing IAIA x IAIO always produces allele combinations that give blood group A, regardless of which allele each parent passes on.

3. A father has blood group genotype IAIA (phenotype A) and a mother has blood group genotype IBIB (phenotype B). What blood group will ALL of their children definitely have?

  1. AAB
  2. BA
  3. CB
  4. DO
Show answer

Answer: A

Crossing IAIA x IBIB always produces allele combinations that give blood group AB, regardless of which allele each parent passes on.

4. A father has blood group genotype IAIA (phenotype A) and a mother has blood group genotype IBIO (phenotype B). What is the probability that their child will have blood group A?

  1. A1
  2. B1/4
  3. C1/2
  4. D3/4
Show answer

Answer: C

Crossing IAIA x IBIO gives allele combinations: AB, A, AB, A. The probability of blood group A is 2/4 = 1/2.

5. A father has blood group genotype IAIA (phenotype A) and a mother has blood group genotype IBIO (phenotype B). What is the probability that their child will have blood group AB?

  1. A1/4
  2. B1/2
  3. C0
  4. D3/4
Show answer

Answer: B

Crossing IAIA x IBIO gives allele combinations: AB, A, AB, A. The probability of blood group AB is 2/4 = 1/2.

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