When crossing pumpkin plants with a disc-shaped fruit in the offspring, 240 plants with a disc-shaped fruit, 154 with a spherical and 26 with an elongated one were obtained. How is the inheritance of the pumpkin fruit shape determined?
Since the crossing was carried out on one basis – the shape of the fruit, it is monohybrid.
In the offspring, during crossing, 3 phenotypic groups were formed (phenotypic splitting 3: 1), this is possible in two cases: with dihybrid crossing according to the law of independent inheritance of characters and with incomplete dominance. Since we are considering a specific 1 trait, we see incomplete dominance in the inheritance of genes.
This means that the inheritance of the shape of the fetus is determined by incomplete dominance of the trait.
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