Question

please use the punnet square below as a reference. add the blood genotypes (6 options) from the answer list to the correct phenotype categories below.

blood type a
blood type o
blood type b
blood type ab

Explanation:

Identify the alleles and dominance relationships

The ABO blood group system is determined by three alleles: \(A\), \(B\), and \(O\). Alleles \(A\) and \(B\) are codominant to each other, and both are completely dominant over the recessive allele \(O\).

Determine genotypes for Blood Type A

Since allele \(A\) is dominant over \(O\), individuals with blood type A (phenotype A) can have either a homozygous genotype or a heterozygous genotype containing the recessive \(O\) allele.

• Homozygous: AA
• Heterozygous: AO

Determine genotypes for Blood Type B

Since allele \(B\) is dominant over \(O\), individuals with blood type B (phenotype B) can have either a homozygous genotype or a heterozygous genotype containing the recessive \(O\) allele.

• Homozygous: BB
• Heterozygous: BO

Determine genotypes for Blood Type AB

Since alleles \(A\) and \(B\) are codominant, both are fully expressed when present together. This results in blood type AB (phenotype AB).

• Genotype: AB

Determine genotypes for Blood Type O

Since allele \(O\) is recessive, the O phenotype can only be expressed when an individual is homozygous recessive.

• Genotype: OO

Answer:

• Blood Type A: AA, AO
• Blood Type B: BB, BO
• Blood Type AB: AB
• Blood Type O: OO