Question

Spemann and his cow workers grafted a piece of prospective neural ectoderm from an early gastrula stage donor embryo in newt of genus Triturus into a region of host embryo where belly skin should develop reason

Answer 1

The Spemann-Mangold organizer, also known as the Spemann organizer, is a cluster of cells in the developing embryo of an amphibian that induces development of the central nervous system. Hilde Mangold was a PhD candidate who conducted the organizer experiment in 1921 under the direction of her graduate advisor, Hans Spemann at the University of Freiburg in Freiburg, Germany. The discovery of the Spemann-Mangold organizer introduced the concept of induction in embryonic development. Now integral to the field of developmental biology, induction is the process by which the identity of certain cells influences the developmental fate of surrounding cells. Spemann received the Nobel Prize in Medicine in 1935 for his work in describing the process of induction in amphibians. The Spemann-Mangold organizerdrew the attention of embryologists, and it spurred numerous experiments on the nature of induction in many types of developing embryos.

Answer 2

This topic is related to Embryonic Induction.

Hans Spemann, a German embryologist along with his co-workers did grafting tests on embryo's of pair of newts, an amphibian.

Triturus cristarus (pigmentless species) and Triturus taeniatus (pigmented species) were chosen for the experiment. A part of prospective neural ectoderm from donor (that was in stage of early gastrula) was grafted into host embryo and it grew into belly ectoderm. Similar steps were followed for neural plate.

Final Research:

Embryo's early gastrula stage was not a factor that determines the fate of neural ectoderm and prospective epidermal ectoderm.

At last, they found that the fate of neural ectoderm tissue was decided by the connective activities of chordamesoderm and the neural ectoderm.