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Multiple fusion: daughter cells different from parent cell?

  1. Aug 9, 2015 #1
    I think in Multiple fusion daughter cells are different from parent cell.I interpreted this by looking at the image below
    multiple.jpg
    Have I interpreted correctly?Is this image reliable?
     
  2. jcsd
  3. Aug 10, 2015 #2

    DEvens

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  4. Aug 10, 2015 #3

    jim mcnamara

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    This process is is called schizogony: mitotic division in which multiple rounds of nuclear divisions occur before the cytoplasm segments. So the resulting cells are all genetically the same.

    The only time you have sexual reprduction (and therefore changes in genes) is in the gut of the malaria mosquito (Anopheles falciparum).
    This picture helps a lot
    https://upload.wikimedia.org/wikipedia/commons/0/0b/Plasmodium_lifecycle_PHIL_3405_lores.jpg

    Look at the diagram.
    Step 1 happens only when the mosquito injects sporozoites. This starts cycle A in your diagram. A only happens after a mosquito bite.
    .... -> step 4 is what you are talking about: where the schizont makes genetic duplicates of itself.
    Step 4 starts another cycle - labelled B. This is the cycle that is the cause of the cyclic nature of malaria. Short periods of violent illness with an interlude of several days - or maybe weeks.

    So malaria kills some liver cells, but repeatedly kills off red blood cells. Marlaria is an extreme problem for millions of people on almost every continent.
    Malaria deaths in 2013 were ~580,000 with about 198 million infections: http://www.who.int/features/factfiles/malaria/en/
     
  5. Aug 10, 2015 #4
    But this does not really answer my question.Please help.
     
  6. Aug 10, 2015 #5

    jim mcnamara

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    What really is your question - the cells are identical after multiple fusion? They are identical genetically.
     
  7. Aug 10, 2015 #6

    Ygggdrasil

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    First, there is no fusion going on in the diagram you're showing. The cells containing multiple nuclei result from mitosis without cytokinesis, not from two cells fusing together. Just as in normal mitosis, this process results in identical nuclei but instead of being segregated into different daughter cells, the two identical nuclei remain in the same cell. The process can repeat to create a cell with many identical nuclei. Here's a section from Molecular Biology of the Cell discussing this phenomenon, with a very nice picture of these multinucleate cells during mitosis: http://www.ncbi.nlm.nih.gov/books/NBK26831/#_A3392_

    Multinucleated cells can arise from many cells fusing together (see https://en.wikipedia.org/wiki/Syncytium), but this is not the process shown in the diagram.
     
  8. Aug 11, 2015 #7
    Sorry I meant Multiple fission in the title .
    And in multiple fission cytokinesis does occur.Right?
     
  9. Aug 11, 2015 #8
    Multiple fission is a type of asexual reproduction.So,I think daughter cells would be same as mother cell(cell which gives rise to those daughter cells)genetically,.But what about size?
     
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