What cross could produce a child with blood type A?

Answer 1

We are looking for the possible blood types of the PARENTS.

Offspring information:

• Offspring type O -- can only be OO; therefore, received an O from each parent

Baby recieves one gene from each parent:

• Parent can be AO giving the O to the child
• Parent can be BO giving the O to the child
• Parent can be OO giving one of the Os to the child

Crosses that will produce the OO (Type O) offspring:

1. AO x AO = OO >> two heterozygous Type As
2. AO x BO = OO >> heterozygous Type A and Type B
3. AO x OO = OO >> heterozygous Type A and Type O
4. BO x OO = OO >> heterozygous Type B and Type O
5. BO x BO = OO >> two heterozygous Type Bs
6. OO x OO = OO >> two Type O parents

Answer 2

We are looking for the possible blood types of a baby.

Parental information:

• Mother type A -- can be AA or AO = contributes A or O gene
• Father type O -- can only be OO = contributes O gene

Baby receives one gene from each parent:

• Baby is type AO = Type A
• Baby is type OO = Type O

Generally with the Type A x Type O mating there cannot be a child with B blood since neither parent carries the B gene.

HOWEVER: There is more to ABO blood typing that just the ABO gene.

There is also an inhibitory gene that will change any genotype into the phenotype O.

Therefore a person with genetically AB blood can be tested as having Type O.

If the Type O parent has the inhibitory gene affecting his Type B or AB blood, then the Type B baby is definitely possible.
yes

Answer 3

Blood type is the common product of three different alleles: Co-dominant IA, and IB, and the recessive i.

Since an individual with blood type A can be either homozygous (IAIA) or heterozygous (IAi) for the gene, the parents must have at least one dominant IA allele.

Possible crosses include:

• IAIA X IAIA
• IAIA X IAIB
• IAIA X IAi
• IAIA X IBi
• IAIA X ii
• IAi X IAIB
• IAi X IAi
• IAi X IBi
• IAi X ii

Answer 4

O type blood is a recessive condition, so the child must have both O type alleles. That means each parent must have at least one O allele, even if they were not O types themselves. If one of the parents is type AB, they cannot produce an O type child. Knowledge of blood types allows one to conduct a rather crude paternity test.

Answer 5

We are looking for the possible blood types of PARENTS.

Available information:

• Baby type O - can only be OO - would have to receive an O from each parent

Baby receives one gene from each parent:

• Mama AO and Papa AO = baby AA, AO, OO
• Mama AO and Papa BO = baby AB, AO, BO, OO
• Mama BO and Papa BO = baby BB, BO, OO
• Mama OO and Papa AO = baby AO, OO
• Mama OO and Papa BO = baby BO, OO
• Mama OO and Papa OO = baby OO

The probability of a Type O baby would depend on the specific parents involved.

Answer 6

Ao x BB