The fact that each plant gets only one allele from each parent plant is detailed in the law of

answer:

the fact that each plant gets only one allele from each parent plant is detailed in the law of law of segregation. mendel found that each pair of alleles segregates independently of the other pairs of alleles during gamete formation.

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i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.