Wilhelm Ludvig Johannsen (1857-1927)

Wilhelm Ludvig Johannsen (1857–1927)

Wilhelm Ludvig Johannsen studied plants and helped found the field of genetics, contributing methods and concepts to the study of heredity around the turn of the twentieth century in Denmark. His experiments on heredity and variation in plants influenced the methods and techniques of geneticists, and his distinction between the genotype of an organism—its hereditary disposition—and its phenotype—its observable characteristics—remains at the core of contemporary biology.

Thomas Hunt Morgan (1866-1945)

<a href="/search?text=Thomas%20Hunt%20Morgan" title="" class="lexicon-term">Thomas Hunt Morgan</a> (1866-1945)

Although best known for his work with the fruit fly, for which he earned a Nobel Prize and the title “The Father of Genetics,” Thomas Hunt Morgan’s contributions to biology reach far beyond genetics. His research explored questions in embryology,

Wilhelm Johannsen's Genotype-Phenotype Distinction

Wilhelm Johannsen's Genotype-Phenotype Distinction

Wilhelm Johannsen first proposed the distinction between genotype and phenotype in the study of heredity while working in Denmark in 1909. The distinction is between the hereditary dispositions of organisms (their genotypes) and the ways in which those dispositions manifest themselves in the physical characteristics of those organisms (their phenotypes).

The French Flag Model

<a href="/search?text=The%20French%20Flag%20Model" title="" class="lexicon-term">The French Flag Model</a>

The French flag model represents how embryonic cells receive and respond to genetic information and subsequently differentiate into patterns.

Cystic Fibrosis

Cystic Fibrosis

Cystic fibrosis (CF) is a fatal, inherited disease found in humans and characterized by buildup of thick, sticky mucus, particularly in the respiratory and digestive tracts. The abnormally thick mucus prevents the pancreas from functioning normally; it often leads to digestive problems and chronic lung infections.


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