Alterations in the Ratio of CD4:CD8 Lymphocytes Are Associated with Risk

question 20

Multiple Choice

Alterations in the ratio of CD4:CD8 lymphocytes are associated with risk of HIV infection progressing to AIDS,of autoimmune diseases,and of progression of some cancers.In searching for predictors of these effects in normal individuals,researchers have found two independent QTLs in the region of the genome known as the major histocompatibility complex (MHC) ,one in a region regulating CD8 and the other in a region regulating CD4.What does this indicate for the general population?

• A)Mutation in one or both of these genes causes HIV and AIDS.
• B)Autoimmune diseases such as type 1 diabetes are caused by one of these genes.
• C)Variation in one or the other of these genes may increase the risk of autoimmune diseases.
• D)Only one mutation can be the cause of rheumatoid arthritis.
• E)The probability of an autoimmune disease demonstrates that additive genes are involved.

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Definitions:

William James

was a pioneering American psychologist and philosopher known for his works on pragmatism and the psychology of religious experience.

Communibiological Approach

Perspective that suggests that genetic and biological influences play a major role in influencing communication behavior.

Implicit Personality Theory

A type of social cognition that describes how individuals infer patterns and traits within others based on limited observations.

Socio-Communication Perspective

A view that examines how social contexts influence communication behaviors and patterns among individuals or groups.