Question

Monogenetic and digenetic flukes

A. are sister taxa discriminated by the latter’s genome having duplicated ancestrally

B. sexually reproduce but show hermaphroditic forms or not, respectively

C. are parasites

D. lack a mesoderm germ layer

E. None of the above are correct

Answer 1

Monogenetic and digenetic flukes are trematodes, which are platyhelminths. They differ by the occurence of alternation of generation, i.e. the monogenetic fluke has only a single stage of development (sexual) whereas the digenetic fluke has two stages (sexual and asexual), the larval development inside a mollusk and the adult stage in another host. Monogenetic flukes are parasites of fish and amphibians, and digenetic flukes are parasites of cats.

Hence, the answer is C. are parasites