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J. B. 1979. Genetics. Houghton Mifflin Co. Boston. D. H. 1959. Blood Group and Genetic Linkage. Brit. Med. , 15:145. A. 1969. Human Genetics. J. C. ) 1928. The Scientific Papers of William Bateson. 2 Volumes. Cambridge University Press, London. P. 1957. Cytology and Cytogenetics. Prentice-Hall, New York. 3 Environment and Gene Expression It is common observation that the phenotype shows modifications in response to the environment. The question arises as to whether the genotype also changes in response to an internal or external environment or not?
It was Johannsen who coined the terms genotype, phenotype and gene in 1903, on the basis of his work on pure lines. In 1906 Yule suggested that continuous quantitative variation may be due to several genes each with a small effect. However, the controversy was finally resolved by the experiments of the Swedish geneticist Nilsson-Ehle in 1909 who demonstrated that in wheat the quantitative effect was in fact due to many genes. The hypothesis was further confirmed by East in 1910 from his studies on inheritance of corolla length in tobacco.
The Himalayan rabbit is a classic example for illustrating multiple alleles, first studied by Sturtevant in 1913. The wild type rabbit has grey fur and is called agouti; rabbits with all white fur and pink eyes are albino; the Himalayan has white fur on the body, but its feet, tail, ears and tip of nose are black (Fig. 1). When crosses were made between agouti and albino, and between agouti and Himalayan, both albino and Himalayan were found to behave as recessive to agouti. When Himalayan and albino were crossed, F1 were all Himalayan, and in F2 3 Himalayan : 1 albino were produced.