A pumpkin with yellow disc-shaped fruits was crossed with a pumpkin that had white spherical fruits. All hybrids from this cross had a white color and a disc-shaped fruit shape. What signs dominate? What are the genotypes of parents and offspring? Which genotype plant should I choose in order to produce an analysis cross? What will be the splitting by genotype and phenotype in F2?
1) A – white fruits, and – yellow fruits,
B – disc-shaped fruits, b – spherical fruits
The white color of the fruits dominates over the yellow, the disk-like shape of the fruits dominates over the spherical.
2) Parent genotypes: aaBB x AAbb Offspring genotypes: AaBB
3) We need to take a plant with the aabb genotype.
In the offspring you get 1: 1 AaBb (white in color and disc-shaped): aabb (yellow spherical fruits).
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