what could be some weakness with using a test cross to determine fred genotype
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➡️This can be identified as by the process in which plants, autotrophic protists, and some bacteria use light energy to make sugars and other.
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3 answers · Botany
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Disadvantages?
Well, you'd have to know enough about the genetics and inheritance patterns of the plant in question to know which was the dominant and recessive phenotypes for the trait. If this was a trait controlled by a single gene with complete dominance, it might be simple, but if there were multiple genes controlling the trait (polygenic inheritance), you might not get clear results.
Assuming this was a single-gene trait with complete dominance, you'd need to acquire a plant that had the recessive trait, if you didn't have one.
You'd need to plant the seeds of the cross and raise them until they were old enough to show the feature you wanted to identify as being homozygous dominant or heterozygous in the original plant. This could require a lot of space and resources to have a sufficient sample size (pots, soil, water, fertilizer). It could also require a lot of time - if the plant was an orchid, and the trait something to do with the flower, some orchids don't flower until they're at least seven years old.