The term systematics is derived from Latinized Greek word-systema-as applied to the systems of classification developed by early naturalists, notably Linnaeus. According to Simpson, Systematics is the scientific study of kinds and diversity of organisms and of any and all relationships among them. Systematics includes taxonomy, identification, classification and nomenclature and all other aspects of dealing with different kinds of [...]
In this article we will discuss about the meiotic division of a cell. The meiotic division includes two complete divisions of a diploid cell resulting into four haploid nuclei. The first meiotic division includes a long prophase in which the homologous chromosomes become closely associated to each other and interchange of hereditary material takes place between them. Further, in the [...]
The following points highlight the three successive stages of oogenesis. The stages are: 1. Multiplication phase 2. Growth phase 3. Maturation phase. Oogenesis: Stage # 1. Multiplication Phase: The primordial germinal cells divide repeatedly to form the oogonia (Gr., oon = egg). The oogonia multiply by the mitotic divisions and form the primary oocytes which pass through the growth phase. [...]