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 [...]
In this article we will discuss about:- 1. Meaning of Cleavage 2. Planes of Cleavage 3. Types 4. Effects of Yolk 5. Mechanism 6. Chemical Changes 7. Different Chordates 8. Importance in Embryonic Pattern. Contents: Meaning of Cleavage Planes of Cleavage Types of Cleavage Effects of Yolk in Cleavage Mechanism of Cleavage Chemical Changes during Cleavage Cleavage in Different Chordates [...]