In this article we will discuss about the cell division in eukaryotes. Eukaryotic cell division involves two major events: (a) The division of nucleus into two daughter nuclei (karyokinesis), and (b) The division of cytoplasm to produce two daughter cells, each cell normally having a single daughter nucleus (cytokinesis). In eukaryotes there are two types of cell division, mitosis and [...]
In this article we will discuss about:- 1. Subject-Matter of Paramecium 2. Reproduction and Mode of Action of Paramecium 3. Origin of Paramecium. Subject-Matter of Paramecium: Sonneborn in 1943 found that Paramecium aurelia strains could be classified into "Killer" and "Sensitive" types. The killer strain secreted a toxic substance "paramecin" in the growing medium and this toxin was responsible for [...]
The following points highlight the top four examples of cytoplasmic inheritance in eukaryotes. The examples are: 1. Sigma Virus of Drosophila 2. Milk Factor in Mouse 3. Maternal Sex Ratio Condition in Drosophila 4. Cytoplasmic Male Sterility (CMS). Cytoplasmic Inheritance: Example # 1. Sigma Virus of Drosophila: Normally, Drosophila is anesthetized by CO2 without any after effect. But certain strains [...]