What could be some weaknesses with using a test cross to determine Fred’s genotype?

The disadvantage of this test and it's weakness is if there is a genetic trait with complete domination, then the plant with the recessive characteristic has to be acquired.

Explanation:

To determine a genotype is not that easy and effortless because you can't see the genes of one organism if you just look at it.

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both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.