Which types of phenotypic ratios are likely to occur in crosses when dealing with three gene pairs for which all the genotypic combinations are of equal viability?
A) 27:9:9:9:3:3:3:1
B) 1:2:1, 3:1
C) 1:4:6:4:1, 1:1:1:1
D) 12:3:1, 9:7
E) 2:3, 1:2

Question

Quizplus · Accepted Answer

The 27:9:9:9:3:3:3:1 ratio is characteristic of a dihybrid cross involving three gene pairs with complete dominance, assuming all genotypic combinations have equal viability. This ratio reflects the combination of phenotypes resulting from the independent assortment and segregation of alleles for each gene.

Which Types of Phenotypic Ratios Are Likely to Occur in Crosses