题目内容

动物性别决定的理论有哪些？性别决定的实质是什么？

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[A]had
[B]wanted
[C]hated
[D]receive

[A]when
[B]how
[C]that
[D]where

According to the passage, which of the following statements is TRUE？
[A] Folk healers choose different herbs to cure diseases without any sound basis.
[ B] People who practice folk medicine need lots of formal education on herbs.
[C]The success of folk medicine led to the development of doctor medicine.
[ D] Natural cures worked better than scientific medicine in ancient times.

仅有雄花序的玉米给仅顶端有雌花序的玉米授粉，F₁仅有雄花序，用F₁给仅顶端有雌花序的玉米授粉，后代表现如下：1株仅顶端有雌花序，1株仅有雄花序，分析原因？