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In the pea plants, Mendel observed that the "T" allele ([[dominance (genetics)|dominant]]) masked the effects of the "t" allele ([[recessive]]). The terms "dominant" and "recessive" are used for the masking and the covered allele, respectively. All offspring from this cross are [[heterozygotes]] in terms of their [[genotypes]]. They also are tall (because the allele for tall masks the allele for short) in terms of their "[[phenotype]]".<ref>{{cite web |author=Lisa M. Meffert |title=Crossing the Parental Lines: Female Contribution |work=Introduction to Mendelian Genetics |url=http://www.bioedonline.org/slides/content-slides/heredity/introduction-to-mendelian-genetics/?pageaction=displaySlideDetails&tk=30&dpg=6 |publisher=BioEd Online |accessdate=March 12, 2014}}</ref>
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In the first chapter of his 1930 book ''[[The Genetical Theory of Natural Selection]]'' [[Ronald Fisher]] demonstrates that [[Mendelian inheritance]] shows that [[natural selection]] and not [[mutation]]s drive [[evolution]], and that it firmly discounted [[blending inheritance]], thus paving the way for the [[Modern evolutionary synthesis]].<ref>Fisher R. 1930. ''[[The Genetical Theory of Natural Selection]]'', Chapter 1.</ref>
== Notes ==
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