Which characteristic of prokaryotic organisms makes them different from eukaryotes

Eukaryotes can be either single or multi celled. Prokaryotic cells do not have a nucleus or any membrane-bound organelles.

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the genotypes would be 50% bb and 50% bb

the phenotypes would be 50% brown and 50% white. hope this : )

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.