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1. If selection is not practised by pollination takes place it becomes very slow e.g. grain yield. Fro SM plants like cabbage able to select head which time by flowerly
2. If the trait is too much influenced by environment the genetic combinations is obscured also time if traits vary from low heritability.
3. Its low if traits selected for is under the influence of many genes
Kavungya answered the question on March 12, 2019 at 08:30
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