The gonads found in medusa are not formed in it but actually they are formed in the ectoderm of blastostyle which later on migrate into the medusa and become situated on its radial canals. Thus, it is rather difficult to distinguish between sexual and asexual generations. Hence the term metagenesis is used to replace the term alternation of generations in Obelia.
Such an alternation of generations between two diploid phases is known as metagenesis. Although, the phenomenon of metagenesis is also reported in other groups of animals but it is well represented by polymorphic hydrozoan like Obelia. Obelia shows polymorphism in which the polyps are for feeding the colony, blastostyles for budding and medusae for disseminating gametes.
Metagenesis In Obelia Pdf Download
Q3. What is metagenesis? Mention an example which exhibits this phenomenon. Ans: Alteration of generation is known as metagenesis. Obelia exhibits this phenomenon. 2ff7e9595c
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