Q19 / 230 · NTA Abhyas (NEET) 2020 · Zoology · Body Fluids and Circulation

Which of the following combination of parents can produce a child with erythroblastosis fetalis?

  • Correct answer
    A
    Rh-ve Mother and Rh+ve Father
  • B
    Rh+ve Mother and Rh-ve Father
  • C
    Rh+ve Mother and Rh+ve Father
  • D
    Rh-ve Mother and Rh -ve Father

Solution

Erythroblastosis fetalis occurs due to Rh incompatibility. It occurs in the second and subsequent Rh+ve foetus in an Rh-ve mother. Rh factor is produced on our RBCs by a dominant gene 'R'. Hence, the genotype of Rh-ve mother is 'rr'. To have a baby which is Rh+ve, the father has to be Rh+ve with genotype 'RR' or 'Rr'.

Hence, the correct answer is option: 'A'.

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