Question

red blood cells carry antigens on their surfaces coded for by alleles of the gene designated by the letter / p is dominant to i and produces antigen a on the surface of red blood cells. the /^ allele is also dominant to the / allele and produces antigen b on the surface of red blood cells. the i allele does not produce surface antigens. use this information to label the possible genotypes of each blood type. human blood types antigen a type a antigen b type b antigen a antigen b type ab no antigen type o

Explanation:

Step1: Analyze Blood Type A

Blood type A has antigen A. Since \(I^A\) is dominant to \(i\), the possible genotypes are \(I^AI^A\) (homozygous) and \(I^Ai\) (heterozygous).

Step2: Analyze Blood Type B

Blood type B has antigen B. Since \(I^B\) is dominant to \(i\), the possible genotypes are \(I^BI^B\) (homozygous) and \(I^Bi\) (heterozygous).

Step3: Analyze Blood Type AB

Blood type AB has both antigen A and antigen B. So the genotype is \(I^AI^B\) (codominance).

Step4: Analyze Blood Type O

Blood type O has no antigens. So the genotype is \(ii\) (recessive).

Answer:

• Antigen A (Type A): \(I^AI^A\), \(I^Ai\)
• Antigen B (Type B): \(I^BI^B\), \(I^Bi\)
• Type AB: \(I^AI^B\)
• Type O: \(ii\)