backcross
v. 使(杂种)回交(或逆代杂交); n. 回交;逆代杂交;回交子代
n.[生]回[逆]交,回交杂种
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v. 使(杂种)回交(或逆代杂交); n. 回交;逆代杂交;回交子代
n.[生]回[逆]交,回交杂种
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