Reproductive isolation but more specifically I think it would be geographic isolation
The physical expression of genes are phenotype. Phenotype is the expression of the gene by the appearnace of the organism. It is the characteristics of that trait.
Examples : When pigment is made in our eyes, height ( tall and short) , weight, blond hair is the phenotype for the blond hair genotype and skin colour( black, white ) is the phenotype trait.
During DNA replication, <span>the template strands must separate so that both can be copied.</span>
