"Forces that can disturb this natural Balance are selection, mutation, gene flow, and natural selection. Certain gene-controlled traits are selected for or against by the partners involved. "
能干扰这种自然平衡的外界因素有选择、突变、基因流动以及自然选择。某些受基因控制的性状为与之交配的异性个体所选择或不选择。
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