Congenital deafness in human beings is inherited as a recessive condition. Two deaf individuals, each homozygous for a recessive mutation, get married and produced four children with normal hearing. Propose an explanation for why none of their children are deaf.

There are many causes of deafness

Explanation:

At the moment, it cannot be ascertained if the deafness can be caused by a gene mutation. This also makes it complicated to pin point the exact genetic causes of the problem. This means that there is no particular genome that can be pinpointed to the condition.  

the answer is b)3/8x+1

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added