What is meant by “induction” in embryology? Describe the famous organizer experiment of Spemann and Mangold and explain its signifi cance.  What are homeotic genes and what is the “homeobox” contained...

What is meant by “induction” in embryology? Describe the

famous organizer experiment of Spemann and Mangold and

explain its signifi cance.

 What are homeotic genes and what is the “homeobox”

contained in such genes? What is the function of the

homeobox? What are Hox genes? What is the signifi cance of

their apparently universal occurrence in animals?