题干

我国植物学家将“蓝色妖姬”(一种玫瑰)的茎尖细胞放在培养基中进行培养,最终发育成完整的新植株.

(1)过程③和④分别表示____和____ .

(2)在培养过程中,除了提供水分、无机盐、糖类、维生素及氨基酸外,还需要在培养基中加入____.

(3)从育种的角度看,植物组织培养与有性生殖相比,优势主要有(请列举两点)____ 、____ .

(4)在植物组织培养的过程中,可以对____ 进行化学或物理的诱变处理,促使其发生突变,再通过诱导分化形成植株,从中选育出优良品种,这种作物新品种的培育方法属于诱变育种.

(5)若将玫瑰的茎尖细胞换成玫瑰的花粉粒经组织培养形成植株,染色体加倍后当年便可得到稳定遗传的优良品种,这种育种方法称为____ ,其优点是____.

上一题 下一题 0.0难度 选择题 更新时间:2014-06-16 08:42:35

答案(点此获取答案解析)

\u8131\u5206\u5316,\u518d\u5206\u5316,\u690d\u7269\u6fc0\u7d20,\u80fd\u4fdd\u6301\u4eb2\u672c\u7684\u4f18\u826f\u6027\u72b6,\u80fd\u5927\u91cf\u5feb\u901f\u7e41\u6b96,\u6108\u4f24\u7ec4\u7ec7,\u5355\u500d\u4f53\u80b2\u79cd,\u80fd\u660e\u66

同类题5

阅读理解

    Proudly reading my words, I glanced around the room, only to find my classmates bearing big smiles on their faces and tears in their eyes. Confused, I glanced toward my stone-faced teacher. Having no choice, I slowly raised the report I had slaved over, hoping to hide myself. “What could be causing everyone to act this way?”

    Quickly, I flashed back to the day Miss Lancelot gave me the task. This was the first real talk I received in my new school. It seemed simple: go on the Internet and find information about a man named George Washington. Since my idea of history came from an ancient teacher in my home country, I had never heard of that name before. As I searched the name of this fellow, it became evident that there were two people bearing the same name who looked completely different! One invented hundreds of uses for peanuts, while the other led some sort of army across America. I stared at the screen, wondering which one my teacher meant. I called my grandfather for a golden piece of advice; flip (掷) a coin. Heads—the commander, and tails—the peanuts guy. Ah! Tails, my report would be about the great man who invented peanut butter, George Washington Carver.

    Weeks later, standing before this unfriendly mass, I was totally lost. Oh well, I lowered the paper and sat down at my desk,burningto find out what I had done wrong. As a classmate began his report, it all became clear, “My report is on George Washington, the man who started the American Revolution.” The whole world became quite! How could I know that she meant that George Washington?

    Obviously, my grade was awful. Heartbroken but fearless, I decided to turn this around. I talked to Miss Lancelot, but she insisted: No re-dos; no new grade. I felt that the punishment was not justified, and I believed I deserved a second chance. Consequently, I threw myself heartily into my work for the rest of the school year. Ten months later, that chance unfolded as I found myself sitting in the headmaster's office with my grandfather, now having an entirely different conversation. I smiled and flashed back to the embarrassing moment at the beginning of the year as the headmaster informed me of my option to skip the sixth grade. Justice is sweet!