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Offlinetheblacksheep
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Registered: 01/08/14
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Two haploid sex cells fuse what happens to nuclei
    #20968771 - 12/12/14 09:06 PM (9 years, 5 months ago)

I've been at this all day and I feel like I've gotten contradicting answers. I believe when they become diploid the chromosomes pair up but the nuclei stay seperate which changes a monkaryotic to a dikaryotic pair. I feel dumb asking but am I right?

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Invisiblelipa

Registered: 07/24/07
Posts: 2,684
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Re: Two haploid sex cells fuse what happens to nuclei [Re: theblacksheep]
    #20972499 - 12/13/14 06:59 PM (9 years, 5 months ago)

Two monokaryons containing haploid nuclei fuse to form a dikaryon and then when the two nuclei migrate up into a basidia they form a diploid cell which undergoes meiosis (when things get exchanged) and produces 4 haploid nuclei which transfer into the resulting spores that are formed.

Edited by lipa (12/13/14 09:45 PM)

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Offlineleschampignons
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Registered: 08/30/13
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Re: Two haploid sex cells fuse what happens to nuclei [Re: lipa]
    #20973084 - 12/13/14 09:11 PM (9 years, 5 months ago)

Quote:

lipa said:
Two monokaryons containing haploid nuclei fuse to form a dikaryon and then when the two migrate up into a basidia they form a diploid cell which undergoes meiosis (when things get exchanged) and produces 4 haploid nuclei which transfer into the resulting spores that are formed.




I think it should be added here that it remains dikaryotic [i.e. (n+n) two nuclei per cell] and the migration into a basidia step to form a diploid cell (fusion of these two haploid nuclei) only occurs as the fruit body if forming.

Not sure if this is obvious to OP but I hope this helps reinforce the concepts.


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Invisiblelipa

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Re: Two haploid sex cells fuse what happens to nuclei [Re: leschampignons]
    #20973207 - 12/13/14 09:47 PM (9 years, 5 months ago)

Yeah I should have included that.

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Offlinetheblacksheep
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Registered: 01/08/14
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Re: Two haploid sex cells fuse what happens to nuclei [Re: lipa]
    #20979558 - 12/15/14 01:23 PM (9 years, 5 months ago)

So two monokaryons fuse to form a dikaryon and them the two nuclei migrate up into the te basida they form a diploid cell which only occurs as the fruit body is forming which then under gos mesiosis and produces 4 haploid nuclei which transfers into the resultig four basidiospores connected to the matured basida. Thanks for answering my questions guy I weren't over meiosis and have a much better understanding. I do how ever have one last question pertaining to the two graphs I am about to post. In the first graph a dikaryotic cell is shown at the start of meiosis which is 2n or two nuclei in the second graph of meiosis it only shows one nucleus am I missing something here or should there be two nuclei in the first stage of meiosis in the second graph.




Edited by theblacksheep (12/20/14 11:50 AM)

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