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1. You need superior genotypes in the original population (in high concentration) in order to make progress.
2. There is need to concentrate the superior genes needed without loosing variability
3. There’s need all the time to genetically resistance the present variability I.e. diversify because of these weaknesses, have come up with recurrent selection.
Kavungya answered the question on March 12, 2019 at 08:34
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