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例小麦麦穗基部离地的高度受四对基因控制,这四对基因分别位于四对同源染色体上。每个基因对高度的增加效应相同且具叠加性。
For example, the height at the base of wheat ears was controlled by four pairs of genes, which were located on four pairs of homologous chromosomes respectively. Each gene has the same additive effect on height and is additive.