The following points highlight the two main steps of mitosis. The steps are: 1. Karyokinesis 2. Cytokinesis. Step # 1. Karyokinesis: Karyokinesis (Gk. karyon- nucleus, kinesis- movement) is also called indirect nuclear division because the nucleus passes through a complicated sequence of events before forming two daughter nuclei. Though the process is continuous one without any pauses, it has been [...]
The below mentioned article provides an essay on the Cell Cycle. Rudolf Virchow (1855, 1859) was the first to suggest that new cells are formed from the division of the pre-existing cells— omnis cellula e cellula (every cell is derived from a cell). In 1873, Strasburger similarly proposed that nuclei are formed from pre-existing ones. Boveri (1879) and Flemming (1879, [...]
In this article we will discuss about:- 1. Meaning of Meiosis 2. Divisions of Meiosis 3. Significance 4. Need 5. Types. Meaning of Meiosis: Meiosis (Gk. meioum or meio— to lessen) is a double division which occurs in a diploid cell (or nucleus) and gives rise to four haploid cells (or nuclei), each having half the number of chromosomes as [...]