The main disadvantage of growing a potato crop with few variations may be the loss of yield in a changing environment. It is a consequence of artificial selection.
What is artificial selection?
Artificial selection refers to the mating process made for humans in order to select crops and animals' progeny with desired traits.
The main subject of concern in artificial selection is the loss of valuable genetic variability.
In this case, artificial selection may lead to the potato crops being unresponsive to challenging environments.
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