1. In 1822 Gregor Mendal was born on a farm in Austria. His father found that Mendal was interested in plants. He knew that his son was clever, and he
Mendal to high school. At that time
people attended high school. However, since his father could not give him enough money, he always went
. Luckily, the other students always gave him food from their
Later, Mendal became a monk(修道士)and
his studies. He took care of the gardens at the
where he and the other monks lived, and he did
with pea plants for eight years. He wanted to prove that parents
features to their children. Around 1860, Mendal
that plants have recessive and dominant(显性的) genes.
He grew a tall pea plant with a short pea plant. Every one of the first generation of four pea plants was tall. This
that tall was the dominate gene.
in the next generation of four pea plants, one plant was very
. The recessive short genes it received from both of its parents had made it short.
From these experiments, he understood that dominant genes
the most often in the
. Recessive genes only appeared
and only when both parents carried the genes for the features.
To
his finding with others, he wrote a paper. But during his lifetime, no one
what he had discovered. At the time of his death, he still felt very sad.
, his important discovery was accepted in 1990. We now know that both plants and animals have genes and that genes play a major role in
we look, how we act, and whether or not we are
to get certain diseases. Today we honor Mendal as Father of hereditizm(遗传学).
【小题1】 | A.drove | B.sent | C.forced | D.had |
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【小题2】 | A.few | B.a few | C.many | D.a lot |
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【小题3】 | A.anxious | B.crazy | C.hungry | D.straight |
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【小题4】 | A.plates | B.dining-rooms | C.dorms | D.lunches |
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【小题5】 | A.lasted | B.stuck | C.started | D.continued |
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【小题6】 | A.village | B.hometown | C.temple | D.school |
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【小题7】 | A.researches | B.surveys | C.observations | D.experiments |
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【小题8】 | A.passed | B.gave | C.offered | D.hid |
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【小题9】 | A.noticed | B.discovered | C.declared | D.prove |
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【小题10】 | A.agreed | B.meant | C.announced | D.informed |
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【小题11】 | A.Thus | B.Instead | C.Despite | D.Yet |
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【小题12】 | A.strange | B.fine | C.short | D.cool |
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【小题13】 | A.showed up | B.stood out | C.set aside | D.turned on |
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【小题14】 | A.parents | B.students | C.children | D.monks |
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【小题15】 | A.seldom | B.sometimes | C.actually | D.mainly |
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【小题16】 | A.compare | B.share | C.satisfy | D.cooperate |
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【小题17】 | A.concerned with | B.worried about | C.trusted in | D.cared about |
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【小题18】 | A.However | B.Though | C.Finally | D.Regardless |
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【小题19】 | A.how | B.what | C.where | D.which |
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【小题20】 | A.possible | B.obvious | C.able | D.likely |
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