Blood Type Compatibility: A+ Mother & O Father – Possible Offspring Blood Types

Mother: A+ (genotype AO or AA); Father: O (genotype OO).

Possible Offspring

• If mother AO: 50% Type A (AO), 50% Type O (OO).
• If mother AA: 100% Type A (AO).

Rh Factor: Mother + (DD or Dd); Father − (dd).

• If mother DD: 100% Rh+.
• If mother Dd: 50% Rh+, 50% Rh−.

Combined Outcomes

Mother Genotype	Possible Child Blood Types
AA, DD	A+ only
AA, Dd	A+, A−
AO, DD	A+, O+
AO, Dd	A+, A−, O+, O−

O− is possible only if mother is AO and Dd (heterozygous for both).