减数分裂中染色体数目减半的直接原因是_刷题宝

题干

减数分裂中染色体数目减半的直接原因是（）

A：同源染色体的联会

B：同源染色体分离进入不同的子细胞

C：非同源染色体的自由组合

D：染色体的复制

上一题下一题 0.0难度选择题更新时间:2018-02-14 09:46:03

答案(点此获取答案解析）

B

同类题1

下列有关人体消化和吸收的叙述，正确的是（）

同类题2

stay in the hospital

同类题3

喜马拉雅山脉是哪两大板块碰撞挤压造成的？

同类题4

将函数y=sinx的图象上每点的横坐标缩小为原来的

（纵坐标不变），再把所得图象向左平移

\frac{π}{6}

个单位，得到的函数解析式为（）

同类题5

阅读理解，判断正误。

A dog is walking along a road. It is a big dog. It is carrying a piece of meat. The piece of meat is in the dog's mouth. The dog is walking across a bridge now. There is water under the bridge. The water is very deep. The dog is looking into the water. It can see a dog in the water. This dog has a piece of meat in its mouth, too. The big dog is barking at the dog in the water. It wants its piece of meat, too. The big dog's piece of meat is falling into the water.

小学学科试题库

初中学科试题库

高中学科试题库