But this leaves us with a problem. Is the
Golden bud or pale green leaf colour a
Homozygous Dominant (BB) or is it Heterozygous
(Bb).
So now is the time to perform the Test
Cross. Any test cross is a cross of an organism
with an unknown dominant genotype (like in our
case) with an organism that is homozygous
recessive for that same trait.
To do this test we need another cannabis
plant of the opposite sex that is homozygous
recessive (bb) for the same trait. So we will
stick with bud colour as our example. Hey, we
have a few silver bud plants around that we
think are recessive. Let’s use them and see
what happens. We pollinate the female plant
(Does not matter if the female is dominant or
recessive one), and we get our seeds and plant
them. 3 - 7 months later we see the results.
This brings us to the next important rule
that we will learn.
If any of the offspring from a test cross
have the recessive trait, the genotype of the
parent with the dominant trait must be
Heterozygous.
We will explain why in a moment and this
will all make sense to you. Also we must
mention that we should be talking about a large
population here. 1000 plants is a good
