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