1.单选题- (共14题)
A.23对、46条、92条 | B.46个、46个、92个 |
C.23对、23个、92条 | D.46个、23个、46个 |
A.AbC、ABc、ABC、abc | B.ABc、ABC、aBC、aBC |
C.ABC、abc、aBC、Abc | D.ABc、ABc、abC、abC |
A.表现型是基因型与环境共同作用的结果 |
B.表现型一定,基因型可以转化 |
C.环境影响了基因型,进一步影响了表现型 |
D.表现型相同,基因型一定相同 |
A.YYRR和YYRr | B.YYrr和YyRr |
C.YYRr和YyRr | D.YyRr和Yyrr |
编号 | 亲本交配组合 | 子代的表现型和植株数目 | |||
粒大油少 | 粒大油多 | 粒小油少 | 粒小油多 | ||
一 | 粒小油少×粒大油多 | 403 | 0 | 397 | 0 |
二 | 粒大油多×粒大油多 | 0 | 431 | 0 | 141 |
三 | 粒小油少×粒大油多 | 413 | 0 | 0 | 0 |
(1)上述两对相对性状中的显性性状是 。
(2)组合一中两个亲本的基因型是 ;亲本均为纯合子的组合是第 组。
(3)若让第三组产生的子代植株与粒小油多种子长成的植株杂交,则它们产生的种子应有 种表现型,其中粒大油多性状所占比例约为 。
A.染色体→DNA→基因→脱氧核苷酸 | B.染色体→DNA→脱氧核苷酸→基因 |
C.染色体→脱氧核苷酸→DNA→基因 | D.基因→染色体→脱氧核苷酸→DNA |
2.选择题- (共6题)
Beethoven had an ugly face and a very 1 temper(脾气), but people 2 him to their homes.When he lost his temper, they forgave(原谅)him.He was often poor and ill during his life.After one illness, he suddenly 3 himself deaf.At that time he was 4 31.What a blow it was on him!
5 this didn't stop Beethoven 6 on in his life.He went on 7 much music. He wrote long pieces and short pieces, happy ones and 8 ones.During his life, he composed(作曲)about 300 pieces. 9 people's surprise, he wrote some of his best and most beautiful pieces 10 he became deaf.Many of them are known and loved all over the world.
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【1】题量占比
单选题:(14道)
选择题:(6道)
-
【2】:难度分析
1星难题:0
2星难题:0
3星难题:0
4星难题:0
5星难题:0
6星难题:6
7星难题:0
8星难题:5
9星难题:3