Step 1: Understanding linkage.
Linkage refers to the tendency of genes that are close together on a chromosome to be inherited together during meiosis.
Step 2: Historical context.
- Thomas Hunt Morgan studied fruit flies (Drosophila) in the early 20th century.
- He observed that some genes do not assort independently, violating Mendel's law of independent assortment.
Step 3: Concept formulation.
- Morgan proposed that genes located on the same chromosome tend to be inherited together.
- This led to the concept of gene linkage and genetic mapping.
Step 4: Contribution of others.
- Mendel: formulated the laws of inheritance, but unaware of chromosomal location.
- Punnett: developed the Punnett square for predicting genotypes.
- Boveri: worked on chromosome theory of inheritance but did not define linkage.
Step 5: Conclusion.
Thus, the term Linkage was proposed by Thomas Hunt Morgan.