Alternation of generation is a type of reproduction that we see in plants and some plants especially like ferns, mosses, hornworts and liveworts follow this method of reproduction. Plants that follow this type of reproduction method have two stages of lifecycle. They can reproduce sexually and asexually. The gametophytes will create a male and a female gamete, and when they come together or unite, they form the sporophyte. The saprophytes then create the spores using the asexual reproduction method. These spores germinate in the gametophytes.
They mature and they continue multiplying the same process. Several varieties of ferns follow this kind of reproduction cycle. In the second stage of the reproduction, the cells are split into two halves so that the same clone does not grow. So the plants grow only with half the DNA structure. The gametophytes formed in this way have two important parts, one is the male reproductive organ and the other is the female reproductive organ. When you observe the back of the fern, you will find these spores lined through out the leaf from top to bottom. The fern plant has long leaves that are thin and spiny. So, when you turn it around, you will see little brown spots lining the ferns. There will be several of them. These brown dots are responsible for creating more plants.
In the alternation of generations kind of reproduction, no two plants created from the same cells have the same structure. That is why fern plants are unique, and they make their natural selection process in an alternative way.
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