Answer:
16
Step-by-step explanation:
In a dihybrid cross, where two different traits are being considered, there are four possible combinations of alleles in the parental generation (P generation) that can produce different genotypes in the offspring. Each trait has two alleles, resulting in a total of four different genotypes for each trait.
When considering both traits together, the number of different genotypes in the resulting progeny can be determined by multiplying the number of genotypes for each trait. Since there are four genotypes for each trait, the total number of different genotypes in the progeny is 4 x 4 = 16.
Therefore, in a dihybrid cross, there are expected to be 16 different classes of genotypes in the resulting progeny.