Question

In the metagenesis of Aurelia and Obelia, what form produces gametes? What form reproduces asexually?

Answer 1

Metagenesis is a type of life cycle in which there are two different forms of the same species, one which is haploid and the other which is diploid. During one of these stages, gametogenesis occurs and fertilized gametes produce the zygote that then develops into the other form. Metagenesis is also known as alternation of generations or as the diplobiontic life cycle.

In the metagenesis of some coelenterates, such as Aurelia and Obelia, alternation between polypoid and medusoid forms take place. Polyps reproduce asexually, producing medusae that then release gametes. The male and female gametes unite under water to form the zygote that then develops into larva and later produces another polyp. The form that reproduces asexually is the polyp. Polyps produce medusae via budding in Obelia and via strobilation in Aurelia.