Agriculture Reference
In-Depth Information
Here is the table.
Homozygous Dominant: BB = Golden Bud.
Heterozygous: Bb = Golden Bud
Homozygous Recessive: bb
= Silver Bud.
(The Golden and Silver bud colors are the phenotype. The b and B are
genotype notations.)
The reason why Bb is golden and not silver is because B
dominates b.
Most phenotypes are observed characteristics but some things
like bud taste are also phenotypes that can not be observed. If we look
at a Mostly Sativa species like a Haze plant we will notice that it is
pale green. Now in a population of Haze plants we may notice that one
or two out of one hundred maybe dark green and not pale green. This
suggests that the dark green color is recessive. We are not totally sure
until we have completed the test but the gene frequencies suggest this.
We may also notice that the bud is golden on most of the plants so this
suggests that the golden bud color is a dominant trait. Some of the
buds on only a few of the plants may be silver. This suggests that the
silver trait is Recessive (bb in our example).
We know that the only genotype that produces the recessive
trait is homozygous recessive (bb). So if a plant shows a recessive trait
in its phenotype, its genotype is probably homozygous recessive.
A plant with a recessive trait always has a homozygous
recessive genotype.
