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.

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Definitions:

Schizophrenia

A severe mental disorder characterized by distorted thinking, perceptions, emotions, language, sense of self, and behavior.

Cure

The complete resolution or eradication of a disease, leaving the individual with no ongoing symptoms or need for treatment.

Family Therapy

A form of psychotherapy that focuses on work with families and couples in intimate relationships.

Reframing

A strategy in which problems are restated so that they can be more easily dealt with.