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发布时间:2023-10-23 06:48:23

[简答题]用有3个X连锁隐性性状盾片刚毛(scute brisrles,sc)、黑体色(sable body,s)、和朱砂色眼(vermilion eyes,v)的雌性果蝇与野生雄果蝇杂交。F1代中的所有雌性果蝇都是野生型,而所有的雄性果蝇都是3突变型。用F1代的雌雄果蝇作亲本杂交所得1000F2的表型统计于下表。试回答下列问题:
(1)确定亲本(P1)和F1代的表型和基因型;
(2)能否用表中F2的表型数据确定3隐性基因的图距,如果可以请给出他们的图距和顺序;
(3)3基因间的交换是否有染色体干涉,如果有请计算并发系数(C)并说明是正干涉还是负干涉,要求给出解题思路。
测交子代类型 测交子代数量 子代百分比
sc s v 314 59.4%
+ + + 280
+ s v 150 30.6%
sc + + 156
sc + v 46 7.6%
+ s + 30
sc s + 10 2.4%
+ + v 14

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Ten major body systems in the human body:
1) the skeletal system, which includes the bones and the (1) ______ (1) ______
tissues.
2) the muscle system, which plays the role of moving the body, pushing
the food through the body and making the blood (2) ______ (2) ______
3) the nervous system which is made up of the brain, the spinal
(3) ______and the nerves. (3) ______
4) the (4) ______system which comprises of the stomach and the (4) ______
intestines and (5) ______food to provide energy for the body. (5) ______
5) the respiratory system which consists of the windpipe and
(6) ______and takes air into the body. (6) ______
6) the circulatory system which includes the blood, the heart,

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