A Sharp Contrast Between Balanced Polymorphism and the Three Types

question 44

Multiple Choice

A sharp contrast between balanced polymorphism and the three types of natural selection is that in balanced polymorphism,

• A) polygenic traits in a population may mask the observation of extreme or intermediate phenotypes.
• B) Not only are multiple alleles persistent in a population, but they may preserve positive, neutral, and negative phenotypes.
• C) multiple alleles of a gene persist indefinitely in a population.
• D) many traits persist in a population that are controlled by only a single allele.
• E) positive, neutral, and negative phenotypes may be preserved in a population.

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Definitions:

Groundwater

The subsurface water that occupies the pore spaces in soils and rocks, serving as a major source of fresh water for many areas.

Seas Saltier

A condition resulting from the evaporation of ocean water, which increases the concentration of salts, making the seas saltier.

Quartzite

A hard, metamorphic rock formed from quartz-rich sandstone that has undergone heat and pressure transformations.

Weather

The state of the atmosphere at a place and time as regards heat, dryness, sunshine, wind, rain, etc.