Protozoans - regeneration in invertebrates, Biology

Protozoans - Regeneration in Invertebrates

Most single celled animals such as protists, i.e. protozoans, regenerate very well. If part of the cytoplasm is removed from the amoeba it is readily replaced. An identical process takes place in flagellates and ciliates. In each instance, though, regeneration occurs only from that fragment of the animal (cell) which consists of the nucleus. A protozoan in which regeneration has been extensively studied is Stentor. It is a large ciliate organism where regeneration takes place only if both the cortical cytoplasm and nuclear genome (which is a large beaded macronucleus) are present in the pan that is to regenerate.

It regenerates in the same way as it reproduces. For reproduction it first divides transversely and after that each half reforms an entire animal. Likewise when Stentor is cut transversely into two halves, then the wound at each cut end heals. The anterior part reconstitutes first by regenerating its posterior end. After this the posterior cut end regenerates its anterior portion. So two animals are formed each complete with cortical cytoplasm and nuclear genome.

Posted Date: 1/31/2013 5:53:48 AM | Location : United States







Related Discussions:- Protozoans - regeneration in invertebrates, Assignment Help, Ask Question on Protozoans - regeneration in invertebrates, Get Answer, Expert's Help, Protozoans - regeneration in invertebrates Discussions

Write discussion on Protozoans - regeneration in invertebrates
Your posts are moderated
Related Questions
two larva forms of sponge

what is ascus ?

What is Chromosomes ? The terminology used to describe DNA replication may sometimes be confusing. Originally, the term "chromosome" referred to the structures seen through the

After stinging its victim, the honeybee leaves behind the barbed stinger, poison sac, and muscles that continue to pump venom into the wound. A study compared two methods of removi

Explain the Consequences of Malnutrition? Malnutrition manifests itself in terms of illness and death in all age groups. Children, pregnant women, nursing mothers and elderly a

How do bacteria reproduce? Bacteria replicate by binary fission (scissiparity). Some bacteria though present a kind of sexual reproduction (transformation, transduction or conj

Ventricular Assist Devices :  These come handy when IABP has failed or when prolonged circulatory support is needed. Now Ieft ventricular (LVAD), right ventricular (RVAD) and bive

How are the plant tissues classified according to their functions? Plant tissues are separated into growth (embryonic) tissues, supporting, filling and photosynthetic tissues (

What is global warming? Global warming is the enhance in the temperature of the planet due to accumulation of some gases in the atmosphere, especially gases that retain the sol

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4