阅读下列短文，根据短文内容填写表格。(每空限填一词)     

    Hi! Do you know the three children? They are in a happy family. Xiao Xue is a helpful girl. She is beautiful. She likes studying. She studies very hard. She gets up early and finishes her breakfast quickly .Then she rides her bike to school . Liu Xing is a little lazy. He gets up late and then washes his face, brushes his teeth in a hurry. Then he goes to the bus stop without breakfast. He usually plays basketball after school. In the evening, he seldom (很少)does homework. He goes to bed late. Xiao Yu is a lovely boy. He gets up very slowly and then he usually takes a shower(淋浴)at home before breakfast. After that, he goes to school in his father’s car. He likes watching TV in the evening.

若人造卫星绕地球做匀速圆周运动，则离地球越远的卫星（   ）

野生型果蝇的眼形是圆眼，某遗传学家在研究中偶然发现一只棒眼雄果蝇，他想探究果蝇眼形的遗传特点，便设计了如图甲所示的实验（亲代果蝇均系纯合子）．雄果蝇的染色体组成图及性染色体分区段如图乙所示．据图分析回答下列问题：

（1）若F₂中圆眼：棒眼=3：1，则该对性状受一对等位基因控制，____ 是显性性状．若F₂中圆跟：棒眼=27：37，则该对性状受____ 对等位基因控制．

（2）若该对性状受常染色体上一对等位基因控制，与果蝇眼形相关的基因型有____ 种；若这对基因位于性染色体（X、Y染色体上的I区段），则与果蝇眼形相关的基因型有____ 种．

（3）若F₂中圆眼：棒眼=3：1，且仅雄果蝇中有棒眼，则控制圆眼、棒眼的等位基位于性染色体上，可能位于乙图中X、Y染色体的____ 区段．

（4）若已经研究清楚，该对性状受常染色体上一对等位基因控制．圆眼纯合果蝇与棒眼果蝇杂交，在后代群体中出现了一只棒眼果蝇．出现该棒眼果蝇的原因可能是亲本果蝇在产生配子过程中发生了基因突变或染色体片段缺失，为了探究其原因，现有人设计了如下的实验步骤，请您帮助完成结果预测．（注：一对同源染色体都缺失相同片段时胚胎致死；各型配子活力相同）

①用该棒眼果蝇与基因型为Aa的果蝇杂交，获得F₁；

②F₁自由交配，观察、统计F₂表现型及比例．

结果预测：

Ⅰ．如果F₂表现型及比例为圆眼：棒眼=____ ，则为基因突变；

Ⅱ．如果F₂表现型及比例为圆眼：棒眼=____ ，则为染色体片段缺失．