What would result if a defect in gastrulation caused too little mesoderm inside the embryo?

Question

A.  Too little endoderm, resulting in missing gut and organs
B.  Too little ectoderm, resulting in missing nervous system or skin
C.  Problems in muscle development
D.  Too little protoderm, resulting in missing organs


Clarify Question
What is the key concept addressed by the question?

What type of thinking is required?


Gather Content
What do you already know about the fate of the mesoderm? What other information is related to the question?

Choose Answer
Given what you now know, what information is most likely to produce the correct answer?


Reflect on Process
Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
 

Answer 1

C.  Problems in muscle development

Clarify Question
What is the key concept addressed by the question?
     · This question is asking about the consequences of a deficiency of mesoderm cells.

What type of thinking is required?
     · Apply level:
       o You are being asked to take what you already know and use, or apply, it to the fate of an embryo with too few mesoderm cells.


Gather Content
What do you already know about the fate of the mesoderm? What other information is related to the question?
     · Gastrulation creates the three primary germ layers: endoderm, ectoderm, and mesoderm.
     · The cells in each germ layer have very different developmental fates.
     · The cells that move into the embryo to form the tube of the primitive gut are endoderm; they give rise to the lining of the gut and its derivatives (pancreas, lungs, liver, etc.).
     · The cells that remain on the exterior are ectoderm, and their derivatives include the epidermis on the outside of the body and the nervous system.
     · The cells that move into the space between the endoderm and ectoderm are mesoderm; they eventually form the notochord, bones, blood vessels, connective tissues, muscles and internal organs such as the kidneys and gonads.

Choose Answer
Given what you now know, what information is most likely to produce the correct answer?
     · A deficiency of cells in the mesoderm would not necessarily impact the endoderm or the ectoderm. 
     · Since the mesoderm cells give rise to the muscles and other structures, lack of cells here could cause an issue with muscle development.


Reflect on Process
Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
     · Apply level:
       o Answering this question correctly depended on your ability to use the germ layers in a new situation. If you got an incorrect answer, did you remember that the mesoderm is the middle germ layer that gives rise to many structures, or that the muscles are one type of tissue that is derived from the mesoderm?