3. In humans, the AB0 blood types are genetically determined by three alleles th

Question

3. In humans, the AB0 blood types are genetically determined by three alleles that occur at the same locus. Since each individual is diploid and carries two alleles for blood type, there are six possible genotypes in our population. List the six genotypes below and assign a phenotype to each genotype based upon the following information. Allele A is dominant over O. Allele B is dominant over O. Alleles A & B are codominant Genotype Phenotype (Blood type) 6. 6. If a man heterozygous for type A blood marries a woman heterozygous for type B blood, what are the possible genotypes and phenotypes of their offspring? Genotype of man: Genotype of woman: Genotypes and Phenotypes of offspring:

Explanation / Answer

Genotype:        Phenotype

1. IAIA               Blood Group A

2. IAIO               Blood Group A

3. IBIB                Blood group B

4. IBIO               Blood group B
5. IAIB              Blood group AB

6. IOIO               Blood group O

IAIO    x     IBIO

         IA        IO

IB      IAIB     IBIO

IO      IAIO     IOIO

Type A: 1/4: IAIO

Type B: 1/4: IBIO

Type AB:1/4: IAIB  

Type O: 1/4: IOIO

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