In pumpkin, the disc-shaped shape (D) of the fruit dominates over the round shape (d) record the crossing of 1 and 2 generations of homozygous and recessive individuals
Homozygous means, most likely, pumpkins with disc-shaped fruits – DD. They produce D.
Pumpkins with a pair of recessive genes – dd will have round fruits and produce germ cells d.
The F1 offspring will be Dd pumpkins with disc-shaped fruits. They will already produce two types of germ cells – D and d.
When crossing hybrid pumpkins, we get F2, represented by the following options:
homozygous disc-shaped pumpkins (DD) – 25%;
heterozygous disc-shaped pumpkins (Dd) – 50%;
homozygous pumpkins with a round fruit (dd) – 25%.
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