private void CalculateFitness()
{
_fitnessSum = 0;
Dna <T> best = Population[0];
Population.ForEach(p =>
{
_fitnessSum += p.CalculateFitness(Population.IndexOf(p));
best = best.Fitness < p.Fitness ? p : best;
});
BestFitness = best.Fitness;
best.Genes.CopyTo(BestGenes, 0);
}