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Some fish change sex over the course of their life.

This phenomenon is called sequential hermaphroditism. In clownfish, smaller fish are male, and the dominant and largest fish in a group becomes female.

In many wrasse the opposite is true—most fish are female at birth and become male when they reach a certain size.

Sequential hermaphrodites may produce both types of gametes over the course of their lifetime, but at any given point they are either female or male. Ferns which grow in soil which has previously supported hermaphrodites are influenced by hormones remaining to develop as male.

Sexual reproduction first appeared about a billion years ago. Sexual reproduction is a process that can only be found in eukaryotes. There are other kinds of organisms (other than animals, plants and fungi), the other eukaryotes – such as the malaria parasite – that also engage in sexual reproduction.

Last modified 17-Apr-2020 18:38