Rh-positive father × Rh-negative mother: what Rh type can the children have?

5. A Rh + ve male marries a Rh-ve female, their progenies will be- (1) Rh +ve only (2) Rh -ve only (3) Can be Rh +ve or –ve (4) Cannot be predicted

5. A Rh + ve male marries a Rh-ve female, their progenies will be-
(1) Rh +ve only
(2) Rh -ve only
(3) Can be Rh +ve or –ve
(4) Cannot be predicted

 

Rh Factor Inheritance: Father Rh+ × Mother Rh–

Basic Genetics

Rh+ allele (R): dominant

Rh– allele (r): recessive

  • de>rr = Rh–ve person (must be homozygous recessive)
  • de>RR or de>Rr = Rh+ve person
Father: Rh+
Genotype: de>RR OR de>Rr
Mother: Rh–
de>rr

Case 1: Father RR (Homozygous)

Cross: de>RR × rr

de>R
de>r de>Rr

All children: de>Rr → 100% Rh+

Case 2: Father Rr (Heterozygous)

Cross: de>Rr × rr

de>R de>r
de>r de>Rr de>rr

50% de>Rr → Rh+
50% de>rr → Rh–

Conclusion: Children can be Rh+ OR Rh–
Depends on father’s unknown genotype

Rh+ve only – ❌ Wrong

True only if father is homozygous de>RR; question doesn’t guarantee this [web:41].

Rh–ve only – ❌ Impossible

Rh+ father carries at least one de>R allele that can be transmitted [web:42].

Cannot be predicted – ❌ Too strong

We can predict both outcomes are possible, just not exact proportions [web:43].

✅ Correct: Children can be Rh+ or Rh– (Option 3)

 

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