Sally has brown hair, which is a dominant trait and is represented by b. but she carries the recessive gene of blond hair represented by b. her husband tom has blond hair, which is a recessive trait and represented by bb. what percentage of their children will have blond hair?

50% of their children will have blond hair

Explanation:

Given ,

Allele for brown hair is represented by "B" and it is a dominant trait

While Allele for blond hair is represented by "b" and it is a recessive trait.

Genotype of Sally when it is given that she carries the recessive gene of blond hair  - Bb

Genotype of Sally's husband who has has blond hair, which is a recessive trait  - bb

Bb x bb

Bb, Bb, bb, bb

Out of four offspring two will have blonde color hair,

Thus, 50% of their children will have blond hair

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.