下图1是某家族中甲病(显性基因为A,隐性基因为a)和乙病(显性基因为B,隐性基因为b

题型:填空题 案例分析题

问题:

下图1是某家族中甲病(显性基因为A,隐性基因为a)和乙病(显性基因为B,隐性基因为b)两种遗传病的系谱图。控制甲乙两种遗传病的基因分别位于两对同源染色体上。经DNA分子结构分析,发现乙病基因与其相对应的正常基因相比,乙病基因缺失了某限制酶的切点。图2表示甲、乙、丙3人的乙病基因或相对应正常基因的核酸分子杂交诊断结果示意图。据图回答下列问题。

目前已发现的人类遗传病有数千种,其中的多基因遗传病常表现出()等特点。

考点:高中生物人类遗传病人类遗传病题库
题型:填空题 案例分析题

楼梯拐角的墙上装了一块镜子(如图所示),方便同学们日常整理仪容的同时,也能更好地在节电的情况下通过光的反射,对楼道进行照明(光能反射到A点).请画出灯S在镜中的像S′和灯S发出的光经过镜子反射到A点的径迹.(保留作图痕迹)

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阑尾炎穿孔手术后第6天,体温上升至39.0℃伴有腹泻及里急后重,下列哪项检查最简便准确

A.大便常规检查

B.直肠指诊

C.腹部B超检查

D.X线腹部透视

题型:填空题 案例分析题

关于先天性肾上腺皮质增生错误的是()

A.是导致男性假两性畸形的最常见类型

B.是常染色体隐性遗传性疾病

C.是导致女性假两性畸形的最常见类型

D.基本病变是胎儿肾上腺合成皮质醇的酶缺乏

E.最常见的是21–羟化酶缺乏,不能将17a–羟孕酮转化为皮质醇

题型:填空题 案例分析题

Body and Food

Your body, which has close relations with the food you eat, is the most important thing you own, so it needs proper treatment and proper nourishment (营养).The old saying “An apple a day keeps the doctor away ”is not as silly as some people think. The body needs fruit and vegetables because they contain vitamin C. Many people take extra vitamins in pill form, believing that these will make them healthy.

But a good diet is made up of nourishing food and this gives all the vitamins you need. The body doesn’t need or use extra vitamins, so why waste money on them?

In the modern western world, many people are too busy to bother about eating properly. They throw anything into their stomachs, eating hurriedly and carelessly. The list of illnesses caused or made worse by bad eating habits is frightening,

小题1:“Your body has close relations with the food you eat.” It really means that ______.

A.all kinds of food you eat can be made into your body

B.your body is made up of the food you eat

C.what you eat has great effect on your health

D.the more you eat, the fitter you will feel小题2:The old saying referred to in the passage tells us that ______.

A.eating apples regularly does lots of good to our health

B.the apple is the best among all kinds of fruits

C.apples can take the place of doctors

D.an apple is a sure cure for illness小题3:From the passage we can draw a conclusion that if we want to keep healthy, we should ______.

A.only eat an apple a day

B.eat properly

C.take as many vitamin pills as possible

D.throw something into our stomachs slowly and carefully

题型:填空题 案例分析题

在C语言中,引用数组元素时,其数组下标的数据类型允许是( )。

A.整型常量
B.整型表达式
C.整型常量或整型表达式
D.任何类型的表达式

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