Activity: Genetics of ABO Blood Types

Type A will result from genetic combination____ or _____.

A+A or A+O

Type B will result from genetic combination____ or _____.

B+B or B+O

Possible outcomes are demonstrated at the right. A and B alleles are dominant over O. AO genotype will have an A phenotype. OO genotypes will have an O phenotype (inherited a recessive O allele from both parents). A and B alleles are codominant. A is inherited from parent 1 and B from parent 2. Results in AB phenotype.

Black - offspring genotype Red - offspring phenotype

Type O will ONLY result from genetic combination_____.

O+O

What determines a person's blood type?

Two genetic alleles (one from each parent) determine a person's blood type

Type AB will ONLY result from genetic combination____.

Type A + Type B

What parental genetics are needed to yield a child with OO (Type O) blood?

Type O + Type O

Could two parents have a child with Type O blood and a child with Type A blood?

Yes

Could two parents have a child with Type O blood and a child with Type AB blood?

Yes

In the above situation, is there more than one possibility for each parent's blood type?

Yes, if both parents pass down the recessive O

What is the phenotype?

a person's blood type- i.e. Type A

What is the genotype?

the alleles that a person was given by the two parents (need to know what the parent's blood types are to determine this)