part A: Which of the following is responsible for dorsal patterning of the Xenop

Question

part A: Which of the following is responsible for dorsal patterning of the Xenopus embryo?

a)VegT

b)Wnt

c)Vg1

d)Xnr

e)ß-catenin

part B: Which of the following is necessary for proper developmental of the kidneys?

a) Reciprocal induction between intermediate mesoderm and endoderm

b) Reciprocal induction between ectoderm and endoderm

c) Reciprocal induction between paraxial and intermediate mesoderm

d) Reciprocal induction between paraxial mesoderm and endoderm Reciprocal induction between intermediate mesoderm and ectoderm

Explanation / Answer

Part-A:

Answer is "e". That is B-Catenin. Dorsal patterning start under the influence of B-Catenin signal. For moredetails please follow the link: http://40.media.tumblr.com/0171e6320f8326a09c5841ec5e23dc3a/tumblr_nns7ovsR031qmenfdo1_1280.png

Part-B:

Answer is "c" Reciprocal induction between paraxial and intermediate mesoderm

Direct contact with paraxial mesoderm induces intermediate mesoderm to form pronephric tubule
-Severing connection prevents kidney formation
Pax2/8 and Lim1 genes make intermediate mesoderm form kidney

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