Predict the results from the following crosses: rr x rr.
a) 50% rr: 50% rr
b) 75% rr: 25% rr
c) 100% rr

A) 50% Rr: 50% rr

The cross Rr x rr, represent a cross between a heterozygous genotype and a recessive genotype.

The offspring of the cross will be; Rr, Rr, rr, rr, which means there 50 percent Rr or heterozygous and 50 percent rr, or recessive.

The formula  for a heterozygous x homozygous recessive cross is;

Formula: Rr x rr

Offspring;

Geneotypes: 50% Rr, 50% rr, and

Phenotypes: 50% dominant trait, 50% recessive trait

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.

and after water is usually warmed by the sun the water temperature raises and then evaporates .