Which one of the following pair is correctly matched
Van Helmont$⇒$Discovered mutations
Louis Pasteur$⇒$Wrote "The Origin of Species''
T.H. Morgan$⇒$Studied sex-linked inheritance
H. Khorana$⇒$Studied $DNA$ replication
Exchange of genetic material between chromatids of homologous chromosomes during meiosis is called
The map distance between genes $A$ and $B$ is $3$ units, between $B$ and $C$ $10$ units and between $C$ and $A$ $7$ units. The order of the genes in a linkage map constructed on the above data would perhaps be
When two genes are situated very close to each other in a chromosome
Who clearly proved and define linkage?
Frequency of recombination between gene pairs on same chromosome as a measure of the distance between genes to map their position on chromosome, was used for the first time by