Question

Imagine a species where there is a locus with two alleles, A and B. Further imagine that A is dominant and B is recessive. How many different phenotypes are possible in this species?

Answer 1

In a species where A is a dominant allele, and B is a recessive allele, two different phenotypes are possible: the dominant phenotype (displayed by genotypes AA and Aa) and the recessive phenotype (displayed by genotype aa).

Step-by-step explanation:

In a species where there is a locus with two alleles, A and B, and A is dominant while B is recessive, there are three possible genotypes: AA, Aa, and aa. However, since A is dominant over B, there will only be two observable phenotypes. Individuals with AA and Aa genotypes will exhibit the dominant phenotype because they have at least one A allele. Individuals with the aa genotype will exhibit the recessive phenotype because they lack the dominant allele.