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Table 1 Mendel's use of different "Merkmal" concepts. Mendel’s notations are compared with modern genotypic notations. Mendel used a short notation for plants as well as a longer one for the immediate products of fertilization

From: Mendel’s terminology and notation reveal his understanding of genetics

Mendel

Modern

Concept

Plant

Zygote (foundation cell)

 

Parental-Character

A or a

A/A or a/a

AA or aa

Hybrid-Character

Aa

A/a

Aa

Dominating Character

A or Aa

A/A or A/a

AA or Aa

Recessive Character

a

a/a

aa