Gregor Mendel concluded that each pea has two units for each trait, and each gamete contains one unit. Mendel's "units" are now called:

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Mendel's "units" are now known as genes, which are responsible for the inheritance of traits. Alleles are variations of a gene, and transcription factors are proteins that regulate gene expression. Characters are the observable traits that are influenced by genes.

Gregor Mendel Concluded That Each Pea Has Two Units for Each