Yes, variations in the genetic material leads to strngth in the evolution process and helps overcome many hereditary problems that may be there. 

Genetic variation is important to evolution because it helps to maintain the health of a population by constituting alleles that may be useful in overcoming stresses such as diseases and pests. Without genetic variation, some of the fundamental mechanisms of evolutionary changes would not operate.

Genetic variation cushions the population against change, offering organisms the flexibility to adapt. A population that has a higher variation of alleles has better chances of evolving to adapt to a changing environment. Such organisms are more likely to survive extreme conditions such as drought and disease epidemics.