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In rice, a trihybrid of unknown pedigree was testcrossed to determine the positions of three genes (s, short; l, loose; r, susceptible) of interest. Below is the data collected from the testcross:
Consider three yellow, round pea, labeled I, J and K. Each was grown into a plant and crossed to a plant grown from a green, wrinkled pea. Exactly 100 peas issuing from each cross were sorted into phenotypic classes as follows: I: 100 yellow, round J: 51 yellow, round; 49 green, round K:24 yellow, round; 26 yellow, wrinkled; 25 green, round; 25 green, wrinkled What were the genotypes of I, J and K (Use the symbols Y, R for the dominant alleles that control the traits, yellow and round respectively)
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