Agriculture Reference
In-Depth Information
because it will reduce a trait in a population or promote a trait in a
population. The strain MAY not be true breeding for the selected
traits, but it will certainly help make the population more uniform for
that trait.
CUBING AND BACKCROSSING
Our first cross between the Master Kush plant and the Silver
Haze is known as the F1 hybrid cross. Let us pretend for the moment
that both traits are homozygous for leaf color. The Haze is pale green
the Kush is Dark Green. Which one is MM or mm we do not know?
Until we see the offspring.
This F1 cross will result in hybrid seeds. Now since M is
dominant over m, then we will know which color is more dominant
and from which parent it came from. In the example let us pretend that
the overall results are pale green. This means that the pale green allele
is dominant over the dark green.
M = Silver Haze pale green leaf trait is dominant.
m = Master Kush dark green leaf trait is recessive.
But we also know that because no variations occurred in the
population that both parents where homozygous for that trait. However
ALL the offspring are heterozygous.
