4．下圖為生態(tài)系統(tǒng)中能量流動(dòng)圖解部分示意圖，①②③④⑤各代表一定的能量值，下列各項(xiàng)中不正確的是

D．甲、乙、丙分別形成4、3、4種配子

3．在研究同一種哺乳動(dòng)物的三個(gè)個(gè)體的兩對(duì)相對(duì)性狀時(shí)，發(fā)現(xiàn)其基因組成是：甲：DBb；乙：DdBB；丙：dBb。由此下列推斷錯(cuò)誤的是

   A．甲、乙、丙三個(gè)生物的體細(xì)胞在細(xì)胞增殖后期染色體數(shù)目都相同

B．D與d位于X染色體上，B與b位于常染色體上

C．三者的基因型為甲：BbX^DY；乙：BBX^DX^d；丙：BbX^dY

A．①過程是轉(zhuǎn)錄，它以DNA的兩條鏈為模板、四種核苷酸為原料合成mRNA

B．②過程中只需要mRNA、氨基酸、核糖體、酶、ATP 即可

C．人的鐮刀型細(xì)胞貧血癥是基因?qū)π誀畹闹苯涌刂�，使得結(jié)構(gòu)蛋白發(fā)生變化所致

D．某段DNA上發(fā)生了一個(gè)基因突變，則形成的mRNA、蛋白質(zhì)一定會(huì)改變

4．下圖為基因的作用與性狀的表現(xiàn)流程示意圖。請(qǐng)據(jù)圖選擇正確的選項(xiàng)（  ）

A．甲發(fā)生在細(xì)胞周期的分裂間期，染色質(zhì)復(fù)制

B．乙發(fā)生在細(xì)胞分裂期的末期，核膜再度合成

C．甲、乙發(fā)生在分裂間期開始到分裂前期，甲細(xì)胞核中染色體：染色體單體：DNA=1：2：2

D．甲發(fā)生在細(xì)胞分裂期的中期，染色體螺旋變粗，數(shù)目最為清晰

2．下圖為細(xì)胞周期中部分細(xì)胞核的變化示意圖，此過程

A．依據(jù)丙圖可可判別出該動(dòng)物的性別是雄性的

B．乙細(xì)胞表明該動(dòng)物發(fā)生了基因突變或基因重組

C．1與2或1與4的片段交換，前者屬結(jié)構(gòu)變異，后者屬染色體基因重組

D．甲與丙的細(xì)胞中均有2個(gè)染色體組，乙細(xì)胞有4個(gè)染色體組

1．下圖是某個(gè)二倍體動(dòng)物的幾個(gè)細(xì)胞分裂示意圖(數(shù)字代表染色體，字母代表染色體上帶有的基因)。據(jù)圖能得出的結(jié)論是

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