In this article we will discuss about the chromosome movement during cell division. The chromosome movement during cell division is chiefly due to the spindle apparatus. This apparatus contains three different types of microtubules: (a) Astral microtubules, radiating from centrioles (found in animal cells only); (b) Continuous or inter-polar microtubules, passing from one pole to the other, account for the [...]
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. Meaning of Meiosis 2. Stages of Meiosis 3. Duration 4. Significance. Meaning of Meiosis: Chromosome number remains constant between the generations in asexually reproducing organisms since reproduction in them is based on mitosis. But in most species sexual reproduction does take place; it involves fertilization, i.e. fusion of male and female gametes. [...]