When two varieties of pumpkin with white fruits are crossed, F1 is also white-fruited, and splitting is observed in F2: 12 white-fruited, 3 yellow-fruited, 1 with green fruits. Determine: 1) the nature of color inheritance; 2) genotypes of parents, F1 and F2 hybrids.
1) The color of the fetus is inherited as an epistatic gene interaction;
2) if the gene that controls the color of the fruit is designated as A, and the epistatic gene is designated as I, then:
a) genotypes P: (female) AAll, (male) aaii;
b) genotypes F1: Aali;
c) genotypes F2: AAII: AAIi: AAii: Aali: Aali: Aaii: aali: aali: aaii in the ratio 1: 2: 1: 2: 4: 2: 1: 2: 1.
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