In Fish

question 10

Multiple Choice

In fish

• A) gills are thick lobes of tissue with little blood supply.
• B) gills are used to rid the body of nitrogenous wastes similar to the kidneys in humans.
• C) about 80-90% of dissolved oxygen in the water is absorbed by the skin.
• D) blood flows through the gills in the same direction that water flows over them.
• E) gases are exchanged between the lamellae of the gills and the water.

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Definitions:

DNA

Deoxyribonucleic acid, a molecule that contains the genetic instructions for the development, functioning, growth, and reproduction of all known living organisms and many viruses.

Heterozygous

Referring to an organism that has two different alleles for a specific gene, one inherited from each parent.

Dominant Allele

An allele that expresses its phenotypic effect even when heterozygous with a recessive allele.