How many phenotypes are represented if two parents both have the genotype Bb?

To determine how many phenotypes are represented by parents both having the genotype Bb, we should consider the possible combinations of alleles that can result from their offspring.

The genotype Bb can produce two types of gametes: B and b. When two parents of genotype Bb are crossed, the potential combinations of alleles in their offspring can be illustrated using a Punnett square. The combinations would be as follows:

• BB (homozygous dominant)

• Bb (heterozygous)

• bB (heterozygous, but genetically identical to Bb)

• bb (homozygous recessive)

From these combinations, we observe three distinct genotypes: BB, Bb (or bB, which is essentially the same as Bb), and bb. Now, we must look at how these genotypes translate into phenotypes.

If we assume that the B allele is dominant over the b allele, the phenotypes can be categorized as follows:

• The phenotype for BB will be the same as Bb (or bB) since the dominant allele masks the effect of the recessive one.

• The phenotype for bb will be distinct because it expresses the recessive traits.

Thus, the distinct phenotypes represented when two Bb parents have