While Observing Goldfish, You Notice That Gill Flaps Move Up

question 61

Multiple Choice

While observing goldfish, you notice that gill flaps move up and down in a constant rhythm. This movement

• A)helps the fish take in small gulps of air and store them in lunglike sacs.
• B)requires less energy than moving air over the gills.
• C)is unnecessary when the fish are swimming constantly.
• D)ensures that the gas exchange organs of the fish are surrounded by oxygen-rich water.

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Definitions:

Genetic Variation

The diversity in gene frequencies within a population, resulting from mutations, genetic recombination, and other sources.

Geographic Variation

Genetic differences that may exist among different populations within the same species. See cline for an example of one type of geographic variation

Sickle Cell Anemia

A genetic blood disorder characterized by red blood cells that assume an abnormal, rigid, sickle shape, leading to various complications.

Homozygous Dominant

A genetic condition where an individual has two dominant alleles of a particular gene, resulting in the expression of the dominant trait.