What would happen to an egg that had a non-functional chorion?

Question

A.  The embryo would suffocate or dehydrate.
B.  The embryo would starve in the egg.
C.  The embryo would die due to high levels of toxic metabolic wastes.
D.  The embryo would develop normally.

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 amniotic egg?

Choose Answer
· Given what you now know, what information and/or problem solving approach 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

A.  The embryo would suffocate or dehydrate.

Clarify Question
· What is the key concept addressed by the question?
        o This question addresses the amniotic egg.
· What type of thinking is required?
        o This question is asking you to analyze the information given, using logic, to dissect the problem and determine the answer.

Gather Content
· What do you already know about the amniotic egg?
        o Amphibians’ eggs must be laid in water or a moist setting to avoid drying out. Most reptiles lay watertight eggs that contain a food source (the yolk) and a series of four membranes: the yolk sac, the amnion, the allantois, and the chorion. Each membrane plays a role in making the egg an independent life-support system. All modern reptiles, as well as birds and mammals, show exactly this same pattern of membranes within the egg. These three classes are called amniotes.
        o The outermost membrane of the egg is the chorion, which lies just beneath the porous shell. It allows exchange of respiratory gases but retains water.
        o The amnion encases the developing embryo within a fluid-filled cavity.
        o The yolk sac provides food from the yolk for the embryo via blood vessels connecting to the embryo’s gut.
        o The allantois surrounds a cavity into which waste products from the embryo are excreted.

Choose Answer
· Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
        o The function of the chorion is to allow gases to pass in and out of the egg, but to retain water, So if there was a problem with the chorion, the embryo would either suffocate or dehydrate.

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?
        o The question required you to analyze the information given, using logic, to dissect the problem and determine the answer.
        o Did you recognize that the chorion is the outermost membrane of the amniotic egg, and it allows gas in and out but keeps water in?