Describe one type of molecular evidence that can be used to determine the genetic relatedness of bacterial strains isolated from naturally occurring populations

The molecular evidence that can be used to determine the genetic relatedness of bacterial strains isolated from naturally occurring populations may be their genetic similarity which leads to expression of one type of proteins.

Explanation:

The entire life of all organisms depend upon the proteins they produce to carry on their metabolism, this protein is based on the central dogma of life which in  turn depends on the protein script of the organism, thereby a particular organism that lives in a same locality will code for similar types of proteins.

organisms that lack symmetry are called asymmetrical and belong to phylum porifera/sponges.

organisms with specialized stinging cells belong to phylum cnidaria. stinging cells are called cnidoblast cells.

cnidarians show two morphological forms : polyp (sessile) and medusa (mobile)

filter feeding is observed in porifera members.  

alternation of generation is observed in coelenterata or cnidaria. there is alternation of asexual polyp form and sexual medusoid form. it is also referred as metagenesis.