Which of the Following Is Not Usually Involved in the Development

question 18

Multiple Choice

Which of the following is not usually involved in the development of a new morphology?

• A)evolution of a new gene to code for the new morphology
• B)homeosis
• C)heterochrony
• D)changes in signaling pathways
• E)changes in the regulatory sequence of a transcription factor gene

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Definitions:

Antigen

Substance that induces a state of sensitivity or resistance to infection or toxic substances after a latent period; substance that stimulates the specific immune system; also called epitope.

Plasma Cells

Specialized white blood cells that produce antibodies in response to infections.

Cytotoxic T cells

A type of immune cell capable of killing cancer cells, infected cells, and other cells that are deemed a threat to the organism.

Antibodies

Proteins produced by the immune system that recognize and bind to specific antigens to help protect the body from infection.