Answer:
If you are crossing two parents that are 'true breeding' - meaning they each have homozygous traits (one has dominant traits, the other has recessive traits) - the F1 generation will typically be heterozygous (having a genotype that is heterozygous and a phenotype that is dominant).
As expected from the 1st law, the F1 generation shows a uniform round yellow phenotype, since one dominant and one recessive allele was inherited from the parents
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