考前必看:2021年专升本考试备考技巧(专业课九)

发布时间:2021-09-13


部分省市2021年专升本考试即将举行,考生也在为考试做最后的冲刺。备考时间余额不足,有效的学习方法就成为了考前提分的重要手段。下面,51题库考试学习网为大家带来专升本考试《遗传学》重点名词解释,正在备考的小伙伴不妨来看看。

等位基因:同源染色体相对位置上决定同种性状的基因。

性状:生物的形态、结构,生理功能过程的特征。

分离:(在生物体的细胞中,控制同一性状的遗传因子成对存在,不相融合;在形成配子时,成对的遗传因子发生分离,分离后的遗传因子分别进入不同的配子中,随配子遗传给后代。)

自由组合:控制两对性状的两对等位基因,位于不同对的同源染色体上,在形成配子时,每对同源染色体上的等位基因分离,而非同源染色体上的非等位基因自由组合。

外显率:一定基因型的群体中表现出预期表型性状的比率。

表现度:具有相同基因型的个体之间基因表达的变化程度称为表现度。

完全显性:两个不同的等位基因同时存在时,只有一个的表型效应得以完全显现。

共显性:一对等位基因的两个成员在杂合体中都表达的遗传现象称为并显性遗传。

不完全显性:由一对等位基因决定的相对性状中,显性是不完全的。

连锁:位于同一染色体上的基因伴同遗传的现象。

交换:由于同源染色体相互间发生互换而使原来在同一染色体上的基因不再伴同遗传的现象。

以上就是专升本考试的相关信息。51题库考试学习网提醒:以上内容仅供参考,小伙伴们在使用时也要注意根据自身情况进行知识点增加或删减。如果还有其他关于专升本考试的疑问,也可留言咨询。


下面小编为大家准备了 专升本 的相关考题,供大家学习参考。

Passage Two
The thought of not sleeping for twenty-four hours or more is not a pleasant one for most people.The amount of sleep that each person needs varies.In general,each of us needs about eight hours of sleep each day to keep our bodies healthy and happy.Some people,however,can get by just a few hours of sleep at night.
It doesn't matter when or how much a person sleeps.But everyone needs some rest to stay alive.Few doctors would have thought that there might be an exception on this.Sleep is,after all,a very basic need.But a man named AI Herpin turned out to be a real exception,for supposedly,he never slept!
A1 Herpin was 90 years old when doctors came to his home in New Jersey.They hoped to negate the claims that he never slept.But they were surprised.Though they watched him every hour of the day,they never saw Herpin sleeping.He did not even own a bed.He never needed one.
The closest that Herpin came to resting was to sit in a rocking chair and read a half dozen news-papers.His doctors were baffled by this strange case of permanent insomnia.Herpin offered the only clue to his condition.He remembered some talk about his mother having been injured several days be-fore he had been born.Herpin died at the age of 94,never having slept a wink.

A1 Herpin's condition could be regarded as______

A.normal
B.curable
C.healthful
D.rare
答案:D
解析:
暂无解析

维持子宫前倾前屈位的韧带是 (  )


A.子宫阔韧带

B.子宫圆韧带

C.子宫主韧带

D.骶子宫韧带

E.卵巢悬韧带
答案:B,D
解析:


答案:
解析:
填1.

民事权利受害人对于损害的发生也有过错的,侵害人的民事责任( )


A.应当减轻

B.可以减轻

C.应当减轻或免除

D.可以免除或减轻
答案:B
解析:
【考情点拨】本题考查了减轻侵权责任的情形的知识点。 【应试指导】《侵权责任法》第26条规定,被侵权人对损害的发生也有过错的,可以减轻侵权人的责任。

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