Agriculture Reference
In-Depth Information
The Hardy and Weinberg principal describes a theoretical
situation in 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.
