Which of the following ratio is not likely to occur in crosses (F 2 ) when one is dealing with two interacting, epistatic gene pairs? 9:3:4 3:1 9:7 12:3:1 15:1
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Step 1: List common two-gene epistatic (interacting) F2 ratios: - 9:3:4 (recessive epistasis) - 9:7 (duplicate/redundant gene interaction) - 12:3:1 (dominant epistasis) - 15:1 (duplicate dominant epistasis) Show more…
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Listed below are 7 two-factor interaction ratios observed in progeny from various dihybrid parents. Suppose that in each of these cases one of the dihybrid parents is testcrossed (instead of being mated to another dihybrid individual). What phenotypic ratio is expected in the progeny of each testcrosses? (1) 9:6:1; (2) 9:3:4; (3) 9:7; (4) 12:3:1; (5) 9:3:3:1; (6) 13:3.
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