填空题环境变化突然使一种隐性等位基因完全致死。要使它的频率从10 -2 减少到10 -3 ，这将经过______代。

填空题人类的性别决定属于______型，鸡的性别决定属于______型，蝗虫的性别决定属于______型。

填空题在Briggs和King对豹蛙去核的未受精卵进行核移植的实验中发现，用个体发育的______以前时期的核移入去核卵细胞，其发育成正常蛙的个体比率可高达100%，用______以后时期的核，成功率为77%。

填空题成虫盘的预定性不是绝对的，预定性可以发生改变，这种现象被称为______。

填空题草履虫的放毒型遗传必须具备______和______两种因素的同时存在。

填空题上位效应可分为______和______。

填空题玉米相互易位杂合体______式分离产生的配子全部可育。

填空题一般来讲，近亲婚配可以提高常染色体______遗传病的发病率。

填空题红色面包霉生长缓慢型，酵母小菌落，放毒型草履虫，都属于细胞质遗传，细胞质基因的载体分别是______、______、______。

填空题父母之一方是AB血型，另一方是O血型，其子女既可能是______血型，也可能是______血型。

填空题分离定律的实质在于形成配子时______彼此分离，自由组合定律的实质在于形成配子时______彼此自由组合。受精时雌雄配子______结合。

填空题线虫的______个细胞进入程序性死亡至少有______个基因在起作用，被定名为______基因。其中______和______为正调控基因，______是细胞死亡的负调控基因。

填空题The first two stages in the development of civilized man were probably the invention of primitive weapons and the discovery of fire, although nobody knows exactly when he acquired the use of the latter. 41) ______ Animals have a few cries that serve as signals, but even the highest apes have not been found able to pronounce words, even with the most intensive professional instruction. The superior brain of man is apparently a necessity for the mastering of speech. When man became sufficiently intelligent, we must suppose that he gradually increased the number of cries for different purposes. It was a great day when he discovered that speech could be used for narrative. There are those who think that in this respect picture language preceded oral language. A man could draw a picture on the wall of his cave to show in which direction he had gone, or what prey he hoped to catch. 42) ______ Two important stages came not so long before the dawn of written history. The first was the domestication of animals; the second was agriculture. Agriculture made possible an immense increase in the number of the human species in the regions where it could be successfully practiced. 43) ______ 44) ______ These inventions and discoveries--fire, speech, weapons domestic animals, agriculture, and writing--made the existence of civilized communities possible. From about 3000 B. C. until the beginning of the Industrial Revolution less than two hundred years ago there was no technical advance comparable to these. During this long period man had time to become accustomed to his technique, and to develop the beliefs and political organizations appropriate to it. There was, of course, an immense extension in the area of civilized life. At first it had been confined to the Nile, the Euphrates, the Tigris, and the Indus, but at the end of the period in question it covered much the greatest part of the inhabitable globe. I do not mean to suggest that there was no technical progress during the time. 45) ______ (512 words)Notes: ape 猿。pastoral nomad 田园式的游牧部落的人。the Euphrates 幼发拉底河。the Tigris底格里斯河。the Indus 印度河。in question 所谈的(在名词后作后置定语)。[A] Probably picture language and. oral language developed side by side. I am inclined to think that language has been the most important single factor in the development of man.[B] Another fundamental technical advance was writing, which, like spoken language, developed out of pictures, but as soon as it had reached a certain stage, it was possible to keep records and transmit information to people who were not present when the information was given.[C] With the development of civilization, primitive people who lived in caves at that time badly needed a language, which would help them to communicate with one another.[D] The origin of language is also obscure. No doubt it began very gradually.[E] In fact, there was progress--there were even two inventions of very great importance, namely, gunpowder and the mariner's compass--but neither of these can be compared in their revolutionary power to such things as speech and writing and agriculture.[F] These were, at first, only those in which nature fertilized the soil after each harvest. Agriculture met with violent resistance from the pastoral nomads, but the agricultural way of life prevailed in the end because of the physical comforts it provided.[G] But industry was a step in human progress to which subsequently there was nothing comparable until our own machine age.

填空题人类珠蛋白基因可分为α珠蛋白基因簇和β珠蛋白基因簇。其中α珠蛋白基因簇位于______号染色体______臂，β珠蛋白基因簇位于______号染色体______臂。每种人体珠蛋白基因都有______个外显子和______个内含子。

填空题比较______构型的细胞的表型从而判断______的测验，称顺反位置效应测验，这种互补作用是______之间的互补作用，所以也称______互补。

填空题绘制遗传学图时，基因定位所采用的主要方法有两种，即______和______。

填空题具有四对等位基因(AaBbCcDd)的一杂合植株，进行自花授粉后出现aabbccdd后代的频率是______，aabbCcDd和AaBbCcDd的频率分别是______和______。

填空题当F + 或Hfr细菌染色体进入F - 后，在一个短时期内，F - 细胞中对若干基因座来说总有一段______体的DNA，这样的细菌称为______。

填空题链孢霉的缓慢生产突变型是因为在______上发生基因突变造成的。

填空题某地区在建立工业区前后，灰色尺蛾与黑色尺蛾的比由95:5发展到5:95，产生这种现象的原因是______。