A correct interpretation of gastrulation is impossible without a knowledge of the position which the presumptive germinal layers occupy in the blastula. This position may be ascertained in various ways. A chart, showing the fate of each part of an early embryo, in particular, a blastula, is called a fate map. In tracing the fate of various parts of the [...]
In this article we will discuss about the process of determining primary organ rudiments of embryos. The activation of genes at the beginning of gastrulation and the resulting synthesis of new kinds of proteins is an important step in development, but in itself it would not be sufficient for initiating the formation of different organs and organ systems of the [...]
Differentiation is a term that is somewhat ambiguous, as it is used at least in two senses – a broader, more general sense and a narrower sense. In the broad sense, differentiation is the process in which the cells or other parts of an organism become different from one another and also different from their previous condition. For example, while [...]