A Researcher Inactivates Lefty1,a Gene Expressed in the Anterior Visceral

question 2

Multiple Choice

A researcher inactivates Lefty1,a gene expressed in the anterior visceral endoderm of the mouse.What effect would inactivation of this gene have on the gastrula-stage embryo?

• A) The epiblast becomes abnormally thickened throughout its cranial-caudal extent.
• B) The primitive streak fails to form.
• C) The endoderm fails to form.
• D) The neural plate fails to form.
• E) Extra primitive streaks form.

---

Definitions:

Small Group

A social unit consisting of a few people (usually not more than ten), allowing for close and mutual interaction.

Content Analysis Technique

A research method used to analyze and interpret texts or media content systematically to identify patterns, themes, or meanings.

Qualitative Textual Approach

A method of research focusing on understanding the meaning within written or spoken materials in a subjective, interpretive manner.

Principles

Fundamental truths or propositions that serve as the foundation for a system of belief, behavior or reasoning.