2022英语周报新实验课程答案

书面表达One possible version:NOTICEA sports meeting will be held in the playground of our school from next Thursday to FridayAs you know, the pressure of study is very heavy now, especially for those senior 3. So the purpose of the sports meeting is to letevery student get relaxed, as a result of which we students can live happily and heal thilyEveryone is welcome to take part in it. Those who perform excellently at the sports meeting will get prizes. But don' t take theresults so serously because taking part is more important than the result. Good luck to everyone!

32((共13分,除标注外,其余每空2分)(1)雄(1分)雌(1分)(2)①Tx"xnx"Y6(1分)5:117/23②Bb位于常染色体上,T/位于X染色体上什么命题人考查遗传规律的应用。区么啊0(1)根据题意,性染色体组成为XO的果蝇性指数=1+2=0.5,发育为雄性;性染色体组成为XXX的果蝇性指数=3+2=1.5,发育为雌性(2)将亲代长翅雌果蝇与长翅雄果蝇杂交得FnF,中雌,雄果蝇之比为1:3,说明有性转变现象,雌性有一洋变成了雄性。①若F中雌果绳全表现为长题,雄果蝇有长翅和残翅两种表现型,则Bb位于X染色体上,T/位于常染色体由于F中雌、雄果蝇之比为1:3,则双亲关于T/的基因型是T(雌性)、(雄性);又因为F中雌果蝇全表现为长翅,雄果蝇有长翅和残翅两种表现型,则双亲关于B/b的基因型是X°x°x°Y,综上,双亲的基因型是TX°x(雌性)nxY(雄性)。F1中雄果蝇的基因型为Tx"Y、XY、nX“x2(不育)、tX”x(不育)、uxYxY,共6种,F1中雌果蝇的基因型为Tx"x1Xx°:F雌、雄果蝇自由交配得到F2,F1产生的雌配子类型及比例为TX:Tx:x:x3:1:3:1,F产生的雄配子类型及比例为TX: IX: TX': IX: TY: Y=1:3: 1: 32:6,则F2中雌果蝇所占比例=12-1/23/8=5/16,故F2中雄果蝇所占比例为11/16,因此F2中雌、雄果蝇之比为5:11。F2长翅雄果蝇的基因型及比例为TxY:nXY;mXx(不育)=30:18:21=10:6:7,故F2长翅雄果蝇及评分标准第29页中不育果蝇的比例为7/23。②若F无论雌雄果蝇都有长翅和残翅两种表现型,则B/b位于常染色体上,T/t位于X染色体上,F1中有残翅个体,则亲本关于B/b的基因型为Bb、Bb,F1发生性转变,亲本均含X,综上,亲本基因型为BbXX(雌性)、BbXY(雄性),F雄果蝇的基因型及比例为BXX(长翅不育):bbXX(残翅不育):BXY: BXY: bbX'Y: bbX'Y=3: 1:3:3:1:1,故F1雄果蝇中不育残翅果蝇所占的比例为1/12。

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