(หCoMplete aud codowiuance practice #2
In a certain cactus, prickly spines can be two pronged or one pronged. If a true
breeding one-pronged cactus is crossed with a true breeding two-pronged cactus,
the F1 generation has a mixture of spines, some are two pronged, some are one-
pronged.
a. Is this an example of codominance or incomplete dominance?
b. Show the F2 generation (a cross between the two F1's) What are the
phenotypes and in what proportion? (Key O =one pronged, T= two
pronged)
Phenotypes
One pronged
%
Two pronged
One and two pronged
%
%
In the same cactus, if you croรsed a plant that has red flowers to one that
has yellow flowers, you produce a cactus that has orange flowers. (Key
R=red and Y=yellow)
a. Is this codominance or incomplete dominance?
b. Show the cross of an orange flowered plant to a red flowered plant.
Phenotypes:
Red flowers
%
orange
flowers
%
Yelow flowers
%
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