In watermelon, rounded fruits are the dominant feature, elongated ones are recessive. A homozygous plant with round fruits was crossed with a plant with elongated fruits. Define genotypes and phenotypes: 1) F1 offspring; 2) F2 offspring; 3) offspring from backcrossing the F1 plant with the parental form having elongated fruits.
1) In F1, all offspring are uniform in genotype (heterozygous) and phenotype (round fruits);
2) splitting occurred in F2: by genotype in a ratio of 1: 2: 1; by phenotype – 3: 1 (3/4 with rounded fruits: 1/4 with elongated fruits);
3) in the offspring from F1 backcrossing with a plant with elongated fruits, splitting by genotype and phenotype is observed in a ratio of 1: 1.
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