What Conclusion Has Been Reached Regarding the Genetic Status of Schizophrenia

question 29

Multiple Choice

What conclusion has been reached regarding the genetic status of schizophrenia using genome-wide association studies?

• A) A single dominant gene is involved.
• B) No single gene or allele makes a significant contribution.
• C) A single recessive gene is involved.
• D) Several dominant genes located on the X chromosome cause this disease.
• E) No more than three loci are involved in the expression of schizophrenia.

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Definitions:

Muscle Contraction

The process where muscle fibers shorten, generating force, following activation by a nerve impulse.

Cross-Bridges

The connection formed between the heads of myosin molecules and actin filaments during muscle contraction.

Tropomyosin

A protein found in muscle tissue that regulates muscle contraction by blocking or exposing binding sites for myosin on actin filaments.

Troponin

A protein complex involved in muscle contraction; found in cardiac and skeletal muscles, its levels in the blood are used as a diagnostic indicator for heart attacks.