The upcoming discuss will update you about the difference between spermatogenesis and oogenesis. Difference # Spermatogenesis: 1. Growth phenomena in nucleus and cytoplasm are not pronounced in spermatocytes. 2. Each spermatocyte produces four functional spermatids of equal size. 3. During maturation, (i) Nucleus remains small which may contract during spermiogenesis into a compact elongated mass, (ii) Nuclear fluid is small [...]
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 Cells 1. Meaning 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 the egg is surgically divided [...]