Their F_2 is backcrossed with 7902- 4, and F_2 of this backcross is backcrossed again with 40354, and then selected by using the modified pedigree and bulk selection procedure.
回交亲本为7902-4和40354。杂种第二代用7902-4进行回交，回交第二代用40354再次回交，之后用改良系谱混合选择法进行选育。
A bulk progeny test is a simple way to learn the effectiveness of mass selection.
集团后代测验是了解混合选择有效性的一个简单方法。
The Bulk Actions menu may also be used to delete multiple topics at once. Select delete from the dropdown after making your selection.
批量应用菜单也可以一次删除多条话题。在决定要删除的话题后选择下拉列表中的“删除”选项即可。
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