In this article we will discuss about:- 1. Meaning of Germ Cells 2. Development of Germ Cells 3. Migration 4. Fate 5. Transformation 6. Spermatogenesis 7. Oogenesis. Contents: Meaning of Germ Cells Development of Germ Cells Migration of Germ Cells Fate of Germ Cells Transformation of Germ Cells Spermatogenesis of Germ Cells Oogenesis of Germ […]
In this article we will discuss about the analysis of nature and action of organizer in amphibian eggs. Grey crescent—its Role in Development: Wilhelm Roux (1888) first described the grey crescent in amphibian egg. The experiments of Rund and Spemann have emphasised the vital role of grey crescent in amphibian development (see Fig. 5.14). If […]
In this article we will discuss about:- 1. Movements of Body Parts in Living Organism 2. Types of Movement in Living Organism. Movements of Body Parts in Living Organism: All the animals are able to move their body parts. (a) Movements of External Body Parts: These serve many purposes: (i) Movements of limbs, appendages, head […]
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