If mother's blood group is O negative and father's blood group is A positive what is baby's blood pressure
ABO blood group inheritance genetics O negative A positive parents
Bailey and Love's Short Practice of Surgery 28th Edition
Page 43
Rh factor inheritance Rh positive Rh negative parents baby blood group
Rh Testing in Early Pregnancy
Page 1
Baby's Possible Blood Groups
ABO System
| Parent | Blood Group | Possible Genotypes |
|---|---|---|
| Mother | O negative | ii (only possibility) |
| Father | A positive | I^A i (heterozygous) or I^A I^A (homozygous) |
- If father is I^A I^A: Baby will be blood group A (100%)
- If father is I^A i (more common): Baby has a 50% chance of A and 50% chance of O
Rh Factor
| Parent | Rh | Possible Genotype |
|---|---|---|
| Mother | Rh negative (Rh−) | dd |
| Father | Rh positive (Rh+) | Dd (heterozygous) or DD (homozygous) |
- If father is DD: Baby will be Rh positive (100%)
- If father is Dd (more common): Baby has 50% chance Rh+ and 50% chance Rh−
Summary of Possible Baby Blood Groups
| Baby Blood Group | Condition |
|---|---|
| A positive | Father is I^A I^A or I^A i, and Rh+ gene passed |
| A negative | Father is I^A i, and Rh− gene passed |
| O positive | Father is I^A i, and Rh+ gene passed |
| O negative | Father is I^A i, and Rh− gene passed |
⚠️ Important: Rh Incompatibility Risk
- Hemolytic Disease of the Newborn (HDN) — maternal anti-D antibodies cross the placenta and destroy fetal Rh+ red blood cells
- Risk is especially high in second and subsequent pregnancies after sensitization occurs
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If mother's blood group is O positive and father's blood group is A positive what is baby's blood group
ABO blood group inheritance genetics O positive A positive parents baby
Bailey and Love's Short Practice of Surgery 28th Edition
Page 43
Rh factor inheritance both parents Rh positive baby blood group
Bailey and Love's Short Practice of Surgery 28th Edition
Page 43
Baby's Possible Blood Groups
ABO System
| Parent | Blood Group | Genotype |
|---|---|---|
| Mother | O positive | ii (only possibility) |
| Father | A positive | I^A I^A (homozygous) or I^A i (heterozygous) |
| Father's Genotype | Baby's Possible Blood Groups |
|---|---|
| I^A I^A (homozygous A) | 100% Blood Group A |
| I^A i (heterozygous A — more common) | 50% Blood Group A, 50% Blood Group O |
Rh Factor
| Father's Rh Genotype | Baby's Rh |
|---|---|
| DD | 100% Rh positive |
| Dd (more common) | 75% Rh positive, 25% Rh negative |
Summary of Possible Baby Blood Groups
| Baby's Blood Group | Likelihood |
|---|---|
| A positive | Most likely |
| A negative | Possible (if both parents carry Rh− gene) |
| O positive | Possible (if father is heterozygous I^A i) |
| O negative | Less likely (requires father to be I^A i AND both parents carry Rh− gene) |
Key Points
- The baby cannot be blood group B or AB, since the mother can only contribute the i (group O) allele.
- No Rh incompatibility risk here — both parents are Rh positive, so there is no concern about hemolytic disease of the newborn from Rh mismatch.
- The most common outcome in practice is A positive, as heterozygous A fathers (I^A i) are common, and Rh positive is the dominant trait.