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which there is no change in the gene pool. This means that
there can be no evolution.
For a test example let us consider a population whose gene
pool contains the alleles B and b. Assign the letter c to the frequency
of the dominant allele B and the letter d to the frequency of the
recessive allele b.
In most cases you will find that c and d are actually notated
as p and q by convention in science, but for this example we will use c
and d.]
The sum of all the alleles must equal 100%.
So c + d = 1.
All the random possible combinations of the members of a
population would equal (c x c) + 2cd + (d x d). Which can also be
expressed as:
(c+d) X (c+d)
We will explain this in detail in moment, but it is best to know it for
now.
The frequencies of B and b will remain unchanged generation after
generation if:
1. The population is large enough.
2. There are no mutations.
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3. There are no preferences. For example a BB male does not prefer a
bb female by its nature.
4. No other outside population exchanges genes with this model.
5. Natural selection must not favor any specific individual.
Let us imagine a pool of genes. 12 are B and 18 are b. Now
remember The sum of all the alleles must equal 100%. So this means
that the total in this case is 12 + 18 = 30. So 30 is 100%.
If we want to find the frequencies of B and b and the
genotypic frequencies of B, Bb and b then we will have to apply the
standard formula that we have just been shown.
f (B) = 12/30 = 0.4 = 40%
f (b) = 18/30 = 0.6 = 60%
Both add to make 100%. Now we know their ratios.
So,
c + d = 0.4 + 0.6 = 1
We have proven that c + d must equal 1.
Very straightforward, yes.
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Remember that all the random possible combinations of the members
of a population would equal (c x c) + 2cd + (d x d), or (c+d) X (c+d)
Then, c + d = 0.4 + 0.6 = 1
And (c x c) + 2cd + (d x d)
= BB + Bb + bb
= .24 + .48 + .30 = 1
This means that the population can increase in size, but the
frequencies of B and b will stay the same.
Now, suppose we break the 4th law about not introducing another
population into this one.
Let us say that we add 4 more b.
b + b + b + b enter the pool. This brings our total up to 34 instead of
30. What will the gene and genotypic frequencies be?
f (B) = 12/34 = .35 = 35 %
f (b) = 22/34 = .65 = 65%
f (BB) = .12, f (Bb) = .23 and f (bb) = .42
Oppss, .42 does not equal 1. This means that the Equilibrium law fails
if the 4th law is not met. When the new genes entered the pool it
resulted in a change of the population’s gene frequencies. However if
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no other populations where introduced then the frequency of .42 would
be maintained generation after generation.
However we would like to point out that we used a very small
pool in the above example. If the pool were much larger then the
number of changes, even if one or two new genes jumped in, would be
insignificant. You could calculate it, but the change would be on an
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On Shishkeberry: I just finished up the Shiskaberry and I have a few notes on it, if anyone is interested. A
friend made my seeds; parents were Breeder Steve’s seeds. The notes below are only from one of the
Shiskaberrys that I have tested. With further testing I will find the definitive Shiska mum.
Aroma - The smell put a smile on a friends face tonight when I pulled out da' sample.
But kaka Trippystickpotency has yet
to
smell a thing. Allergies are a killin' and ka ain't a smellin'.
A bunch of Shisks are drying and I can’t smell
them.
brothers-grimm-marijana
seedbanks
From 8 female blueberries grown from seed 4 were boring lowdown indica stone 1 quite zippy and 3 quite up
and they put a smile on your face I like the last three and will save them for breeding."-Oldtimer
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