Formulate a rule of uniformity for first-generation hybrids.

When two homozygous organisms are crossed that differ from each other in one trait, all hybrids of the first generation will have the trait of one of the parents, and the generation will be uniform on this trait.

1. In hybrids of the first generation, only a dominant trait is manifested.
2. The recessive trait in these hybrids is suppressed.

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