Question

The term gene, genotype and phenotype was proposed by
A. Johannsen
B. Mendel
C. Morgan
D. Bateson

Answer 1

The term gene, genotype and phenotype was proposed by Plant Danish pharmacist, geneticist, plant physiologist (Botanist).He is well known for his 1903 experiment of pure line in genetics. He also worked at Royal Veterinary and Agricultural College in Copenhagen, Denmark, in 1892 as a lecturer of plant physiology.

Complete answer:

Gene: Gene contains the necessary information that is required for the expression of a particular trait in an organism.
One gene one enzyme hypothesis was given by Beadle and Tatum in Neurospora. They said that each gene functions to produce a new enzyme.
After this Jacob and Baltimore proposed one mRNA-one polypeptide hypothesis.
Term gene was given by Johannsen.
Genotype : Genetic complement of an organism of an organised with respect concern at the characters is called genotype.
Term genotype was given by Johannsen.
Phenotype : Phenotype is observable morphological appearance. The phenotypes of an individual are determined by different combinations of alleles e.g., tallness and awareness.
Term Phenotype was given by Johannsen.
Wilhelm Johannsen born on 3 February 1857 was a Danish pill pusher, botanist, plant life scientist, and biologist, he is best known for coining the terms sequence, composition and genotype, and for his 1903 "pure line" experiments in biological science.

Hence the correct option is (A) Johannsen.

Note: Concept of genes was proposed by Mendel but terms gene was not proposed by him at that time he called them factors and started that these factors are units of inheritance.
Phenotypically the same as individuals may have different genotypes for example individuals with genotype TT and Tt gave the same phenotype.
Term allele is proposed by Bateson.
Alleles are the abbreviated form of the term allelomorphs.
Genotype of an organism is decided by genes which they inherit from their parents.