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单选题
Breeding the hybrid offspring to fix desirable traits is called ______.
A
naturally selecting
B
inbreeding
C
pedigree breeding
D
pure-breeding
参考答案
参考解析
解析：
倒数第二段指出对带有desirable traits的个体动植物进行杂交（crossbred），然后使这些杂交后代（hybrid offspring）进行同系繁殖（inbred），从而将这些desirable traits保留并固定下来，因此答案选B。
倒数第二段指出对带有desirable traits的个体动植物进行杂交（crossbred），然后使这些杂交后代（hybrid offspring）进行同系繁殖（inbred），从而将这些desirable traits保留并固定下来，因此答案选B。
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