What was the phenotypic ratio obtained in the experiment on linkage and recombination performed in Lathyrus odoratus (Sweet Pea)?

Based on which of the following did Morgan observe characteristics similar to Mendel's analysis experiments in the fruit fly Drosophila?

. . . . . . $(B)$ . . . . . . used the frequency of recombination between gene pairs on the . . . . . . $(A)$ . . . . . . as a measure of the distance between genes and mapped their position on the chromosome.
$(A) \quad\quad (B)$

Describe linkage and recombination in detail.

Frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes to map their position on the chromosome was used for the first time by

What is recombination? Discuss the applications of recombination from the point of view of genetic engineering.