1.Two parents are heterozygous for familial hypercholesterol

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/24 14:59:21

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

1.25% 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.

1.Two parents are heterozygous for familial hypercholesterol you are two for two "placements are for two 句型转换1.Jack and his parents lived in Beijing for two years.(就 My parents are sometimes l______ for work. His parents make him ______his homework for two hours every They are for two accounts also Here are two letters asking for advice 1.Here are a pen and two books for you. 2.There are no leave 几个初二同义句转换1.Children are dependent on their parents for food There are six sweets,two for me and ------------for you. The children feel their parents are there for them.