Agriculture Reference
In-Depth Information
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.
