It is impossible for a type of O+ baby to have a type of____________mother:

by
It is impossible for a type of O+ baby to have a type of____________mother:

A. AB-
B. O-
C. O+
D. none
 
Parent Blood Type Estimate Table:
ABO Blood Type Calculator:

Father’s Blood Type
A B AB O
Mother’s Blood
Type		 A A or O A, B, AB, or O A, B, or AB A or O Child’s
Blood type Must Be
B A, B, AB, or O B or O A, B, or AB B or O
AB A, B, or AB A, B, or AB A, B, or AB A or B
O A or O B or O A or B O
Child’s Blood Type
A B AB O
Mother’s Blood
Type		 A A, B, AB, or O B or AB B or AB A, B, or O Father’s
Blood type Must Be
B A or AB A, B, AB or O A or AB A, B or O
AB A, B, AB or O A, B, AB, or O A, B, or AB
O A or AB B or AB A, B, or O

ABO blood types can be complicated to understand. This is mostly due to the fact that the ‘O-type’ antigen is masked by the presence of an A- or B-type antigen. This is explained in the following chart, showing the different the genotypes that make up the blood types.

Genotype (DNA) Blood Type
AO or AA A blood type
AB AB blood type
BO or BB B blood type
OO O blood type

 
For example, two O blood type parents can produce a child with only O blood type. Two parents with A blood type can produce a child with either A or O blood types. Two parents with B blood type can produce a child with either B or O blood type. One parent with A and another with B can produce a child with A, B, AB or O blood types. If one parent has A and another has AB, they can either produce a child with A, B or AB blood types. If one parent has A and another has O, they can either produce a child with A or O blood types.