问题 填空题 案例分析题

现有一黑腹果蝇的野生种群,约有107个个体。每个黑腹果蝇个体约有104对基因,如图所示为该种群中某一果蝇体细胞染色体示意图,请分析回答一下问题:

假定该种群中每个基因的突变频率是10-5,那么在该种群中每一代出现的基因突变数是()

答案

参考答案:

2×106

单项选择题
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阅读理解

     [1] World Consumer Rights  Day is celebrated annually by consumer organizations worldwide. It

commemorates the historic declaration on March 15,1962 by John F.Kennedy,the former US President,

of the basic Rights of consumers,which include: "the right to  safety","the right to be informed","the right to

choose",and "the right to be heard".

     [2]This_declaration_has_led_to_international_recognition_by_governments_and_the_United_Nations_

that_all_citizens,regardless of their_incomes_or_social_standing,have_certain_basic Rights_as_consumers.Officially,World Consumer Rights Day was first observed on March 15,1983 and has since become an

important occasion for mobilizing citizen action,with recognition of consumer rights taking off around the

world.On April 9,1985,the United Nations Assembly General Assembly adopted the UN Guidelines for

Consumer Protection that provide a framework for strengthening national consumer protection policies

around the world.

     [3] The  guidelines included  Kennedy's  four basic consumer rights plus another four:  the right to

satisfaction of basic needs;the right to redress (赔偿);the right to education;and the right to a healthy

environment.Currently,the fundamental consumer rights are recognized globally.

     [4]World Consumer Rights Day normally has a theme associated with an activity or development that is

relevant to consumers. Whatever their objectives, they share the same underlying aim of  bringing about

important and needed benefits for consumers.

     [5] In recent years, progress has been made for recognition and protection of  consumer rights in

developing countries.At least,March 15 is a day when consumers are filled with pride and satisfaction.

However,there are many reports on violation of consumer rights by unethical  marketing practices.

1.What is the main idea of the passage?(Please answer within 10 words.)

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2.What was John F.Kennedy mentioned in the first paragraph?(Please answer within 15 words.)

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3.Which of the sentence in the passage can be replaced by the given one?

Presently,countries around the world acknowledge the basic consumer rights.

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4.Please translate the underlined sentence in the second paragraph into Chinese.

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5.What do you think will follow the passage?(Please answer within 20 words.)

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