Sickle-cell anemia is an example of codominance. what implications does this have for people with one or two copies of the sickle-cell gene? a. people with two copies of the mutated gene have healthy red blood cells. people with one copy of the mutated gene don't have the disease but are carriers of the disease. b. people with two copies of the mutated gene have sickle-cell anemia. people with one copy of the mutated gene have healthy red blood cells. c. people with two copies of the mutated gene have sickle-cell anemia. people with one copy of the mutated gene have both healthy and misshapen red blood cells and are carriers of the disease. d. people with two copies of the mutated gene are carriers of the disease. people with one copy of the mutated gene don't have the disease.

The correct answer is C

Explanation:

Codominance means that the result of two different genes will give separated characteristics of both. For example, if an animal has a gene of red skin and another gene of white skin, it will have red in some parts of the body and white skin in other parts. It can be confused with incomplete dominance, which combines the characteristics of the genes, in these case the skin would be pink, the combination of white and red. People who have one gene of it are carriers of the disease of course, because it can be passed to their sons.

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).

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.