What Has Occurred When Natural Selection Shifts Allelic Frequencies Toward

question 23

Multiple Choice

What has occurred when natural selection shifts allelic frequencies toward the extremes of a range of genetic expressions for a particular trait? 

• A) directional natural selection 
• B) discontinuous natural selection 
• C) diversifying natural selection 
• D) stabilizing natural selection

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Definitions:

Hair and Muscular Tissue

Hair and muscular tissue represent distinct types of tissue in the body, with hair composed of keratinized cells for protection and insulation, and muscular tissue composed of fibers that contract to produce movement.

Beta Cells

Cells located in the pancreas that produce insulin, which regulates blood glucose levels.

Alpha Cells

Cells found in the pancreas that produce glucagon, a hormone involved in the regulation of blood glucose levels.

Delta Cells

Cells found in the pancreas that produce somatostatin, a hormone that inhibits the release of numerous other hormones.