Definition: One of Mendel's Laws of Inheritance. This law states an organism has two different alleles for a trait and the allele that is expressed in the phenotype, masking the expression of the other allele is said
to be dominant. The allele whose expression is masked is said to be recessive.
Example: Purple flowers are dominant over white. Purple is dominant; white recessive. When a purple
flowering plant is crossed with a white flowering plant, all off-spring have purple flowers.

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it has to be understood that the sea water contains a huge amount of sodium and chlorine ions and if they enter the cell of the atlantic cod fish, the cell will shrivel and the fish will die. to avoid such a condition, the fish uses active transport for the purpose of removing the ions against the gradient.

explanation:

the atlantic cod is not a maritime osmoconformer. its native application of salts is less than that of the seawater it lives in. it is continually falling water from the gills to the ocean via osmosis.

countering that, the fish is going to be swallowing seawater. but since its internal collection of salts is lower than seawater, the fish will want to go free of excess salt, and since that's going upon a gradient, then active transport, requiring energy, must be used to pump out the salt. much marine fish use the organs to filter out the salt and these fish discharge very straight urine.