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根据短文内容和首字母提示,填写所缺单词,并将答案填写在答题卡标号为66~75的相应位置上。
    When Gregor Mendel was teaching high school students, he noticed that plants had different traits (特征). For example, some pea plants were tall, w________ others were short. Mendel wondered why, so he decided to experiment.
    He c________ the seeds (种子) that were produced. He planted these new seeds and waited for the r________. He wondered whether the new plants would be of medium h________. But all the plants that grew from the seeds were tall.
    Mendel wanted to see what would h________ to the next generation (一代). He crossed the tall plants with each other in the same way he had experimented with the tall and short plants. When the n________ plants grew, three fourths of the plants were tall, and one fourth were short.
    Mendel found out that a plant r________ a message from each of its parents, and that message is carried by the plant's genes (基因). For example, a pea plant gets a gene for tallness or shortness from one or both of its parents. Mendel a________ found out that some genes were stronger than others. The gene for tallness was stronger than the gene for shortness. So a plant would be t________ if it had one gene for tallness and one gene for shortness. But if a plant had two genes for shortness, it would be short.
    Mendel had made a great d________, but few understood it at that time. Mendel became famous only after his death.

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