AP BIOLOGY

Detailed explanation-1: -Danish botanist Wilhelm Johannsen coined the word gene to describe the Mendelian units of heredity. He also made the distinction between the outward appearance of an individual (phenotype) and its genetic traits (genotype).

Detailed explanation-2: -The word “gene” was not coined until early in the 20th century, by the Danish botanist Johannsen (1909), but it rapidly became fundamental to the then new science of genetics, and eventually to all of biology.

Detailed explanation-3: -Wilhelm Johannsen (3 February 1857 – 11 November 1927) was a Danish pharmacist, botanist, plant physiologist, and geneticist. He is best known for coining the terms gene, phenotype and genotype, and for his 1903 “pure line” experiments in genetics.

Detailed explanation-4: -He was the first person to use the term genetics to describe the study of heredity and biological inheritance. Q. Gregor Johann Mendel is known as the ‘Father of Modern ’.

Detailed explanation-5: -The genotype theory In December 1910 the American Society of Naturalists organized a special symposium on ‘The Study of Pure Lines of Genotypes’, with a keynote paper from Johannsen.