Question:

The chromosomal theory of linkage was contributed by

Updated On: Jul 29, 2022
  • Morgan
  • Punnett
  • Bateson
  • Boveri
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Solution and Explanation

Linkage is the phenomenon of certain genes staying together during inheritance through generations without any change or separation due to their presence on the same chromosome. Linkage was first suggested by Sutton and Boveri $(1902-1903)$ when they propounded the famous "chromosomal theory of inheritance." Bateson and Punnett $(1906)$ while working on sweet pea found that the factors for certain characters do not show independent assortment. However, it was Morgan $(1910)$ who clearly proved and defined linkage on the basis of his breeding experiments in fruitfly Drosophila melanogaster. In $1911$, Morgan and Castle proposed chromosome theory of linkage.
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Concepts Used:

Non-Mendelian Genetics

The term - non-mendelian inheritance refers to any pattern of heredity in which features do not separate according to Mendel's laws. These principles describe how features linked with single genes on chromosomes in the nucleus are passed down through generations.

Types of Non-Mendelian Inheritance

Codominance Inheritance

It is a form of incomplete dominance in which both alleles for the same feature are expressed in the heterozygote at the same time. For example, the MN blood types of humans.

Incomplete Dominance

In a heterozygote, the dominant allele does not always completely cover the phenotypic expression of the recessive gene, resulting in an intermediate phenotype which is referred to as "incomplete dominance”.