In humans blood type is determined by the a, b, and o alleles, the a and b alleles are codominant to each other and dominant over the o allele. an individual with the ao genotype and an individual with the bo genotype can produce offspring with which of the following phenotypes?
1.) a, b, or o only
2.) a or b only
3.) a, b, ab, or o
4.) o only
!

Alleles are defined as the alternative forms of gene, which are found on the same loci on a chromosome. The individual with AO and BO genotype will produce offspring with genotype:

3.) A, B, AB, or O

Alleles are the two or more genes that are present on the same locus of chromosome. In the given question, it is given that:

The genotype of the offspring can be A, B, AB, or O. It is due to the co-dominance of alleles. Co-dominance is defined as the relationship between two variants of the gene. In co-dominance, both the alleles are expressed and observed in the phenotype. Thus, the offspring can have any of the blood types.

Therefore, the offspring can posses A, B, AB, or O blood group due to co-dominance of alleles.

To know more about co-dominance and alleles, refer to the following link:

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An Individual with AO genotype and an Individual with BO genotype will produce an offspring with ; ( 3 ) A, B, AB, or O

Given that the alleles A and B are codominant to each other and dominant to allele O, this means that alleles A and B can be seen and expressed in a phenotype while allele O is also dominant but becomes recessive when paired with either A or B.   while  

Phenotype with allele O is seen and expressed when not paired with any dominant allele. therefore Individuals with AO genotype and BO genotype will produce offsprings with  A, B, AB, or O  blood groups due the codominance factor possessed by alleles A and B.

Hence we can conclude that An Individual with AO genotype and an Individual with BO genotype will produce an offspring with ; ( 3 ) A, B, AB, or O

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To know more about co-dominance and alleles, refer to the following link:

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex