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Author Topic: What is the difference in springs  (Read 5128 times)

Gooey

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Re: What is the difference in springs
« Reply #15 on: August 15, 2006, 05:12:57 PM »
Ha looks like you took genetics thru 4rth year ;D...it has been a while but I seemd to remember genotype ratios being 1:2:1 and phenotypes being 3:1 expect for instances like co-dominance then 1:2:1 would be the ratio...its been so long.

And I have never seen a marbled fish personally so I can't comment on that.
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Sandy

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Re: What is the difference in springs
« Reply #16 on: August 15, 2006, 08:20:26 PM »
that explains my red hair  :D
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frenchy

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Re: What is the difference in springs
« Reply #17 on: August 16, 2006, 09:41:41 AM »
Quote from: Gooey on August 15, 2006, 05:12:57 PM
Ha looks like you took genetics thru 4rth year

At least yeah... And I did teach to 3rd years  ;D
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Gooey

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Re: What is the difference in springs
« Reply #18 on: August 16, 2006, 11:22:21 AM »
YA the marble white is a bit of a mystery as the whole run is white and their are virtually no reds in the river at the time so cross breeding of a red and white is virtually impossible due to run timing...maybe its a mutation...who knows.

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frenchy

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Re: What is the difference in springs
« Reply #19 on: August 16, 2006, 12:05:53 PM »
In my opinion, there is no mystery at all. It is not because you do not see Red chinooks in the river that the red allele is not in the population. For exemple, if the frequency of the red allele (R) is 0.1 and the frequency of the white allele (W) 0.9, you will see 81% of white, 18% of marbled and 1% of red (almost none) in the river. The table below show you the frequency of the phenotypes you may expect giving the frequency of the alleles. It may of course be more complicated in nature, but even simple population genetic explain the presence of the marbled in quasi-absence of red salmons.

                                          phenotype frequency
allele frequency               White        Marbled      Red
W         R                       W²            2WR          R²
50%     50%                   25.00%     50.00%     25.00%
60%     40%                   36.00%     48.00%     16.00%
70%     30%                   49.00%     42.00%      9.00%
80%     20%                   64.00%     32.00%      4.00%
90%     10%                   81.00%     18.00%      1.00%
95%       5%                   90.25%      9.50%       0.25%
99%       1%                   98.01%      1.98%       0.01%
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Xgolfman

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Re: What is the difference in springs
« Reply #20 on: August 16, 2006, 09:14:08 PM »
I caught this one last year on the V. it looks albino....as for the meat, though both white and red were equally delicious.
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