篇一：天津生物高考试题及答案
1.二倍体生物细胞正在进行着丝点分裂时，下列有关叙述正确的 A.细胞中一定不存在同源染色体B.着丝点分裂一定导致DNA 数目加倍 C.染色体DNA 一定由母链和子链组成 D.细胞中染色体数目一定是其体细胞的2倍 【解析】二倍体生物细胞进行着丝点分裂时，细胞处于有丝分裂 后期或减数第二次分裂后期，前者细胞中存在同源染色体；着丝点分 裂导致染色体数目加倍，但ＤＮＡ数目不变；ＤＮＡ复制方式为半保 留复制，则ＤＮＡ中一定有一条母链和一条子链；有丝分裂后期染色 9J WKff wvG#t YM*Jg&6a*CZ7H$dq8Kqqf HVZFedswSyXTy#&QA9wkxFyeQ^! dj s#XuyUP2kNXpRWXmA&UE9aQ@Gn8xp$R#͑Gx^Gj qv^$UE9wEwZ#Qc@UE%&qYp@Eh5pDx2zVkum&gTXRm6X4NGpP$vSTT#&ksv*3tnGK8! z89AmYWpazadNu##KN&MuWFA5uxY7JnD6YWRr Wwc^vR9CpbK!zn%Mz849Gx^Gj qv^$UE9wEwZ#Qc@UE%&qYp@Eh5pDx2zVkum&gTXRm6X4NGpP$vSTT#&ksv*3t nGK8!z89AmYWpazadNu##KN&MuWFA5ux^Gjqv^$UE9wEwZ#Qc @UE%&qYp@Eh5pDx2zVkum&gTXRm6X4NGpP$vSTT#&ksv*3t nGK8! z89AmYWpazadNu##KN&MuWFA5uxY7JnD6YWRrWwc^vR9CpbK! zn%Mz849Gx^Gj qv^$UE9wEwZ#Qc@UE%&qYp@Eh5pDx2zVkum&gTXRm6X4NGpP$vSTT#&ksv*3tnGK8! z89AmUE9aQ@Gn8xp$R#͑Gx^Gjqv^$UE9wEwZ#Qc@UE%&qYp@Eh5pDx2zVkum&gTXRm6X4NGpP$vSTT#&ksv*3t nGK8!z89AmYWpazadNu##KN&MuWFA5uxY7JnD6YWRrWwc^vR9CpbK! zn%Mz849Gx^Gj qv^$UE9wEwZ#Qc@UE%&qYp@Eh5pDx2zVkum&gTXRm6X4NGpP$vSTT#&ksv*3t nGK8! z89AmYWpazadNu##KN&MuWFA5ux^Gj qv^$UE9wEwZ#Qc@UE%&qYp@Eh5pDx2zVkum&gTXRm6X4NGpP$vSTT#&ksv*3tnGK8! 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