Transgenic and Gene Targeting Approaches Have Played Important Roles in Understanding

question 5

Multiple Choice

Transgenic and gene targeting approaches have played important roles in understanding lung development and branching morphogenesis.Using this approach,Fgf signaling was blocked in the developing respiratory tree.What was the outcome of this experiment?

• A) Lungs were not induced.
• B) Tracheoesophageal fistula occurred.
• C) Esophageal atresia occurred.
• D) Lungs failed to undergo branching morphogenesis.
• E) Cystic fibrosis occurred postnatally.

Describe the formation and function of extraembryonic membranes in amniotes.

Identify various factors affecting embryonic development, including teratogens.

Understand cell differentiation and pattern formation mechanisms in embryonic development.

Recognize the importance of specific external signals in initiating key developmental processes.

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