英语周报八年级上册28期答案

One possible version:Dear Sir/ MadamKnowing that the First Snow Festival will be held during the winter holidays and some volunteers areneeded, I show great interest in it and want to get more experience. So Pm writing the letter to recommendHonestly speaking, I have rich experience as a volunteer, since I have served as a volunteer in intema-tional competitions. What's more, I'm outgoing and good at communicating with others, making it easy for meto get along with others. Above all, I have a good command of English, and can make myself understoodTherefore, I can serve foreign tourists welId appreciate it if you could give me such a chance. Looking forward to your replyYours

32.(12分(1)反转录(2分)(2)①1/2(2分)②两条非同源染色体上(2分)③分别位于Z、W染色体上(2分)F1个体随机交配,统计F2中的普通型家蚕的性别.如果F2中普通型家蚕中雌雄均有,则基因的位置为a;如F2中普通型家蚕中只有雄性,则基因的位置为b.(1 1 1 1=4分)或(F1个体随机交配,统计F2中耐热型家蚕的性别比例,如果F2中耐热型家蚕中雌:雄=1:1,则基因的位置为a;如F2中耐热型家蚕中雌:雄=21,则基因的位置为b.)或(F1个体随机交配,统计F中家蚕的表现型及比例,如果Fa中耐热雄:耐热雌:普通雄ε:普通雌=33-1:1,则基因的位置为a;如F2中耐热雌:耐热雄:普通雄=2:1:1,则基因的位置为b.)

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