Sexual reproduction in prtista

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Supergroups [1] and typical phyla. The protists do not form a natural group, or cladesince they exclude certain eukaryotes; but, like algae or invertebratesthey are often grouped together for convenience. In some systems of biological classificationsuch as the popular five-kingdom scheme proposed by Robert Whittaker inthe protists make up a kingdom called Protistacomposed of "organisms which are unicellular or unicellular-colonial and which form no tissues ".

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Protists are organisms in the Kingdom Protista. They are usually microscopic and made up of only one protist cell, which means that they are unicellular. Protists are eukaryotic ; they have a nucleus and membrane-bound organelles that set them apart from organisms like bacteria and archaea.

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Notice how the Paramecium is dividing into two cells. This, obviously, is a form of asexual reproduction. But, remember that protists are an extremely diverse kingdom, and some protists can also reproduce sexually. Like all other eukaryotes, protists have a nucleus containing their DNA.

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Cell division in protists, as in plant and animal cells, is not a simple process, although it may superficially appear to be so. The typical mode of reproduction in most of the major protistan taxa is asexual binary fission. The length of time for completion of the process of binary fission varies among groups of organisms and with environmental conditions; generally it ranges from just a few hours in an optimal situation to many days under other circumstances.

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Birds do it, and bees do it. Indeed, researchers estimate that over But why is sexual reproduction so commonplace?

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Share interesting photos to engage biology enthusiasts. Kingdom Protista is one of the four kingdoms which form the Eukarya Domain which is one of the three domains of life on the planet Earth. The fact that protists i.

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A key part of the life cycle of an organism is reproduction. For a number of important protist parasites that cause human and animal disease, their sexuality has been a topic of debate for many years. More recent views of eukaryotic evolution suggest that sex, and meiosis, evolved early, possibly in the common ancestor of all eukaryotes.

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There are overdescribed living species of protists, and it is unclear how many undescribed species may exist. Since many protists live as commensals or parasites in other organisms and these relationships are often species-specific, there is a huge potential for protist diversity that matches the diversity of their hosts. On the other hand, familiar characteristics of plants and animals are foreshadowed in various protists.

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Protists are a diverse group of unicellular, multicellular and colonial organisms. Because all have a true nucleus, every one of these organisms is called a eukaryote. All as well require aquatic environments for survival, including damp soil, animal fur and simply water, both fresh and marine. Protists are from the protista kingdom, which is filled with many kinds of protists as well as both sexual and asexual reproduction.

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