Final answer:
The proportion of individuals with a genotype who show the associated phenotype can be determined using genotypic proportions. In a tetrahybrid cross, the expected proportion of offspring with the dominant phenotype at all four loci can be calculated using the sum and product rules.
Step-by-step explanation:
The proportion of individuals with a genotype who show the phenotype associated with that genotype can be determined using genotypic proportions. In a tetrahybrid cross, the expected proportion of offspring that have the dominant phenotype at all four loci can be calculated using genotypic proportions. The probability of a homozygous dominant genotype at each locus is 1/4 and the probability of a heterozygous genotype at each locus is 1/2. By applying the sum and product rules, the probability of a dominant phenotype at all four loci is equal to 3/4 × 3/4 × 3/4 × 3/4, which simplifies to 81/256.