Bio Meiosis and mitosis

2014-08-12 9:50 am
讀bio等我轉返channel先。。。
i know that the number of chromosomes will be halved when the cell umdergoes meiosis(nuclear division)…… but meiosis has 2 separate divisions ,so in which one will that be starting to be halved? the first/second?or after the 1st meiosis chromosome is already halved then continue until the 2nd meiosis?

next question is the interphase phase:
is the process interphase having thr similar features (DNA replication,synthesis of new organells like ER) and also increase of the cell size to its largest? or just DNA replication?

唔係BIO高手都可以答我架喎!因為我呢d問題都幾急下。

回答 (3)

2014-08-15 10:26 pm
✔ 最佳答案
1 染色體數或套數是看細胞中的"中節"數量,因此第一次分裂前,染色體的複製其實染色體數或套數(2n)均沒變。因為中節沒有複製,也就造成第一次分裂時,染色體數或套數均已減半(N)。第二次分裂因為後期中節複製,故染色體數或套數沒有改變,仍為單套。(n)

2間期中有三個階段G1、S、G2。G1時主要進行胞器複製和細胞長大,S期主要在進行DNA複製,G2主要在合成某些蛋白質。

2014-08-15 14:26:07 補充:
iknow that the number of chromosomes will be halved when the cell umdergoesmeiosis(nuclear division)…… but meiosis has 2 separate divisions ,so in whichone will that be starting to be halved? the first/second?or after the 1stmeiosis chromosome is already halved then continue until the 2nd meiosis?減數分裂的染色體減半是發生在第一次還是第二次分裂?→染色體數或套數是看細胞中的"中節"數量,因此第一次分裂前,染色體的複製其實染色體數或套數(2n)均沒變。因為中節沒有複製,也就造成第一次分裂時,染色體數或套數均已減半(N)。第二次分裂因為後期中節複製,故染色體數或套數沒有改變,仍為單套。(n)
圖片參考:https://s.yimg.com/rk/AE02781988/o/849651377.jpg
nextquestion is the interphase phase:間期的三個階段是進行什麼事?isthe process interphase having thr similar features (DNA replication,synthesisof new organells like ER) and also increase of the cell size to its largest? orjust DNA replication?→間期中有三個階段G1、S、G2。G1時主要進行胞器複製和細胞長大,S期主要在進行DNA複製,G2主要在合成某些蛋白質。 如有疑議請補充!我可以針對您的問題再解說。

2014-08-18 11:18:42 補充:
如果您不滿意本人回答,請直接說明。我一定會自行刪除回答!請不要用投票方式決定,因為這網頁很多網友是來攻擊別人用的,我不願意牽涉到這些非知識的恩怨。謝謝!
參考: 本人(教生物的)
2014-08-15 6:57 am
很欣賞你,馬克!你用中文我會更易明白,可是我想把他們都用英文記住,如果不麻煩,你可以把專有名詞(bio)轉成英文,那就更好了!謝咯!
2014-08-12 6:45 pm
天晴, 達柏莎....有數十個子戶口, 不但經常自問自答D無聊低能問題, 仲要答其他知識友既問題都係無厘頭咁胡亂作答, 再利用D子戶口去為自己投票, 若有其他答題者票數比佢多, 便會向其惡意檢舉, 為求獲得最佳答案

唔信你可以揾下以下呢堆垃圾子戶睇下就知道:
達柏莎.
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收錄日期: 2021-04-12 13:14:08
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20140812000051KK00018

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