What is the expected phenotype outcome for a child with a genotype of BB?

What is the expected phenotype outcome for a child with a genotype of BB?

• A. Type A
• B. Type B
• C. Type AB
• D. Type O

Answer: (B)

The expected phenotype outcome for a child with the genotype of BB is Type B blood. This is because blood type is determined by the presence of A and B antigens on the surface of red blood cells, which are coded by specific alleles. The B allele contributes to the presence of the B antigen, while the A allele contributes to the A antigen. In this case, the child possesses two copies of the B allele (homozygous BB), which means the phenotype will express Type B blood. It’s important to note that blood type also involves the O allele, which does not produce antigens but can affect the phenotype if inherited alongside A or B alleles. However, with a genotype of only BB, the expression of pigment will be solely Type B due to the dominance of the B allele. This understanding of blood type inheritance illustrates how genotypic combinations can lead to specific phenotypic outcomes related to blood type.

The expected phenotype outcome for a child with the genotype of BB is Type B blood. This is because blood type is determined by the presence of A and B antigens on the surface of red blood cells, which are coded by specific alleles. The B allele contributes to the presence of the B antigen, while the A allele contributes to the A antigen.

In this case, the child possesses two copies of the B allele (homozygous BB), which means the phenotype will express Type B blood. It’s important to note that blood type also involves the O allele, which does not produce antigens but can affect the phenotype if inherited alongside A or B alleles. However, with a genotype of only BB, the expression of pigment will be solely Type B due to the dominance of the B allele. This understanding of blood type inheritance illustrates how genotypic combinations can lead to specific phenotypic outcomes related to blood type.