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Old 08-27-2008, 02:48 AM   #1
bluefoxicy
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Yeast have an a- and alpha-type cell and emit two different types of pheramones, which attract the two types of cells to each other. Then they contact and mate.

.... o.o;; And here I thought single-celled microorganisms simply split in two, like graboids.

 
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Old 08-27-2008, 02:56 AM   #2
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Hrm... I thought they reproduced by budding.

 
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Old 08-27-2008, 03:06 AM   #3
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Quote:
Originally Posted by Rick500 View Post
Hrm... I thought they reproduced by budding.
So did I, but Wikipedia lead me to something about lagers, which lead me to ale, which lead me to floating yeast, and yeast mating. o_o

 
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Old 08-27-2008, 03:08 AM   #4
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Well, ew, that's kind of disturbing.

 
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Old 08-27-2008, 12:19 PM   #5
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I think they're one of the species that can do both.
If you only want them to reproduce asexually, stop playing Barry around your carboys.
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Old 08-27-2008, 12:29 PM   #6
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Quote:
Originally Posted by will_cbe View Post
I think they're one of the species that can do both.
+1... Pretty sure they do both, however budding is more common (I think)
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Old 08-27-2008, 12:39 PM   #7
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Quote:
Originally Posted by Rick500 View Post
Well, ew, that's kind of disturbing.
Uh...if you find the concept of yeast mating disturbing, then don't even contemplate what the production of Etoh and Co2, is equal to in the human life cycle....

Years ago, here at the medschool I had to produce an educational film on the sex life of the zebra mussel....Not exactly my kinda making whoopy if you ask me... Basically the male zebra mussel "pops his cork" into the water at the same time the woman shoots out a bunch of eggs into the water...With any luck the two clouds intersect and the eggs get fertalised as they fall to the bottom of the lake....No contact at all.

At least the Yeasties get to actually do the nasty.

BTW, the researcher I was making the film with was trying to break the mating cycle of the zebra mussel by trying to introduce something which would basically make the potential father shoot blanks, or at least miss wildly. One of the substances he was working with was a derivitive of LSD.
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Old 08-27-2008, 12:40 PM   #8

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then don't even contemplate what the production of Etoh and Co2, is equal to in the human life cycle
Yum, yeast pee.

 
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Old 08-27-2008, 03:12 PM   #9
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Yeast can do both, mating introduces genetic variability and allows yeast to evolve. Budding is asexual and creates daughter cells that are identical to the mother cell genetically. Yeast resultant from budding have one copy of the genome (1n) and are haploid. Post mating, yeast are diploid and have two copies of the genome (2n) which can do recombination and leads to genetic diversity. When times get rough, it can split back to haploid cells. To make things more interesting, a-type haploid yeast can switch to alpha-type and vice-versa!

Schizosaccromyces cerevisiae, non-brewing yeast are known as fission yeast, and reproduce by splitting in two, yes, different than brewing yeast which is known as budding yeast.

Yes, I got turned down at a job at a winery for not having enough yeast experience, and the person that got hired does not brew, and has never touched yeast...gotta love networking!

 
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Old 08-27-2008, 06:22 PM   #10
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This bud's for you! Sorry . ColoradoXJ13 is correct. Fermentation is mostly G-rated. Maybe at the end there may be some sex going on as the nutrients get depleted. You know, one last fling before you die.
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