1.Two parents are heterozygous for familial hypercholesterolemia,with blood cholesterol levels two to three times the normal level.What is the probability that their child will be unaffected by this disorder?0 % 25 % 50 % 100 % 2.The law of segregati

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1.Two parents are heterozygous for familial hypercholesterolemia,with blood cholesterol levels two to three times the normal level.What is the probability that their child will be unaffected by this disorder?0 % 25 % 50 % 100 % 2.The law of segregati
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1.Two parents are heterozygous for familial hypercholesterolemia,with blood cholesterol levels two to three times the normal level.What is the probability that their child will be unaffected by this disorder?0 % 25 % 50 % 100 % 2.The law of segregati
1.Two parents are heterozygous for familial hypercholesterolemia,with blood cholesterol levels two to three times the normal level.What is the probability that their child will be unaffected by this disorder?
0 %
25 %
50 %
100 %
2.The law of segregation states that __________.
A.the alleles on one chromosome move independently of the genes on a different chromosome
B.in the formation of gametes,alleles separate from each other so that each gamete receives only one allele
C.sister chromatids separate during anaphase of mitosis
D.male and female gametes segregate independently of each other
3.In the human ABO blood-typing system,an individual with A and B alleles will express both A and B phenotypes on his or her red blood cells.This is an example of __________.
A.complete dominance
B.incomplete dominance
C.codominance
D.polygenic inheritance

1.Two parents are heterozygous for familial hypercholesterolemia,with blood cholesterol levels two to three times the normal level.What is the probability that their child will be unaffected by this disorder?0 % 25 % 50 % 100 % 2.The law of segregati
1.25% 解析:双亲均为家族性的血胆脂醇过多的杂合体,这种疾病病人的血胆固醇的水平是正常人的2~3倍,通过此题意可知此病的遗传为常染色体显性遗传,基因型均为Aa,题目所问的问题是他们所生的孩子中不患此病的概率,即基因型为aa的个体所占的比例;
2.B 解析:此题题干内容所问的是基因的分离定律的内容;
3.D 解析:人类的ABO血型系统,带有A和B基因的个体,他或她的血细胞表现型为AB血型,题目问的是这是哪种遗传的典型实例.A为完全显性遗传,B为不完全显性遗传,C为共显性遗传,D为多基因遗传.ABO血型为复等位基因遗传,即多基因遗传的实例.

单词改错:1.are these your sister ()2.is this dave?no he isn't.()3.those are lin hai parents.()4.these are two my brothers.()5.this is my sister.she name is helen.()6.is his your good friend?() 1.not only his parents,but also he are tired of the from the neighborhood children now.改正错误并翻译出来:2.there are an apple ,two bananas and an orange on the table ;make youself at home.3.most of my space time were spent on reading an Are ___ her parents?A.thisB.theyC.thatD.he He makes p_____in lessons,so his parents are happy He makes p_____in lessons,so his parents are happy Direction: write one or two paragraphs about the following.At the age of 18 Tom learns that his parents who have been with him day and night are his adoptive parents. Some people think that he should find his biological parents, but others disagree. 1.He is waiting for a bus (对画线部分提问) ( )he ( ) ( )?2.My parents are talking abuot my stydy(对画线部分提问)( )are your parents ( ) ( )?3.Lancy is sleeping.(变一般疑问句)( )Lancy( )?4. John is pl He went to Shanghai with his parents ------.A.two month ago.B.two month before.c.two months ago D.two months before. His parents are not at home.He has to look after_____ (he)His parents are not at home.He has to look after_____ (he) Jane's home is on the______(two)floor.Dale______(real)likes Beijing Opera.My parents like swimming because it's______(relax)._______(he)movies are very interesting.Come and see for______(you)at Huaxing Store! My parents are going to stay with me for____ A.more two weeks B.two again weeksC.another two weeks D.the two others weeks 英语改错he went home to see his parents each two weeks : 对画线部分提问he whites two letters to his parents every monthtwo画线 写出下列划线部分提问1.He will see his parents(twice a week)1.He will see his parents(twice a week)___ __ will he see his parents?2.They will(USE pencils to write).___will they___?3.I need(two) boxes of chocolate.___ ___ ___of chocolate do y Single mums are better at raising their kids than two parents怎么翻译 He has two sons,1.and two of them are teachers.2.two of whom are teachers.为什么are teachers是系表结构,什么是系表结构?teachers.不是感官动词啊? 连词成句1.came,our,very,has,he,hard,studied,since,to,he,school.2.for,to,see,hasn't,he,come,parents,two,months,his.3.keep,shouldn't ,you,so,for,long,me,waiting. he following are two ads from Axalto in China Daily.