问题 填空题 案例分析题

以下是科学家在研究生物体的遗传和变异时做过的一些实验。根据实验分析回答:

1909年摩尔根偶然在一群红眼果蝇中发现了一只白眼雄果蝇为了研究白眼性状的遗传,他用红眼的雌果蝇与这只白眼的雄果蝇交配,子一代全为红眼。他将子一代中红眼的雌雄果蝇交配,子二代中红眼和白眼之间的数量比是3:1,就果蝇的红眼和白眼这一对相对性状的遗传来看,其遗传表现符合分离定律,表明果蝇的红眼和白眼是受()控制的。所不同的是白眼的性状表现,总是与性别相联系。于是,摩尔根及其同事设想:()摩尔根等人的设想可以合理地解释实验现象。后来,他们又通过()等实验方法,进一步验证了这些解释。摩尔根所应用的科学研究方法是()

答案

参考答案:3:1,一对等位基因(或一对遗传因子);如果控制白眼的基因在X染色体上,而Y染色体不含它的等位基因,测交;假说—演绎法

写作题

任务型阅读 阅读短文,按要求完成各题。

1) DIY, which means Do It Yourself, is quite popular in UK. Lots of stores and supermarkets sell DIY things. TV programs show people how to DIY.

2) English people like DIY. There is a saying in UK----“As Englishman’s home is his castle”. Huge numbers of people spend their holidays making their homes beautiful “castles”. If there is anything that needs fixing around their homes, such as painting the walls or putting in a new shower, they will do the jobs themselves. They share DIY experience with their friends. More and more people have discovered the joy of DIY. Sometimes people also DIY for saving money. With the economic downturn at present, many people cannot afford a big house. They are looking at how they can make their house better without spending a lot of money. It is not surprising that DIY is so popular.

3) DIY can be difficult. There is a huge market for DIY furniture which people need to get together themselves with a few basic tools. However, people often find it not easy to build a piece of furniture because they can’t understand the instructions. Sometimes the instructions are simple and clear, but the furniture itself is difficult to build. One thing is for sure, though most DIY projects are started with the best intentions. Many of them may not get finished. DIY can also be dangerous. For example, anything electrical should be done by a professional worker. Unluckily, many people don’t care about this warning and put themselves in danger. It is reported that in just one year over 230,000 people were hurt while doing DIY in UK, including 41,000 who fell off ladders.

4) Therefore, DIY can bring us fun and help us save money, but it is not always as easy as it is thought to be if we bite off more than we can chew. Maybe factories should make products that are easier and safer for us to DIY.

小题1:根据短文内容完成句子填空(每空一词)

In the first paragraph, we can know ___________ ___________ DIY is in UK.

小题2:根据短文内容完成句子填空(每空一词)

The second paragraph tells us ___________ ___________ why people like DIY.

小题3:根据短文内容完成句子填空(每空一词)

The examples in the third paragraph show that DIY can be ____________ and ___________.

小题4:把短文中的划线句子翻译为汉语。

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小题5:在文中找出下面句子的同义句,并抄写在横线上。

We do something that is much too difficult for us.

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判断题