Linkage was first studied by .....

Crossing over in a diploid organism is responsible for

The coupling and repulsion theory was proposed by:

Coupling and repulsion are the two faces of

Why did Morgan choose the fruit fly for his experiments to prove the chromosomal theory of inheritance?

$A$ scientist performed a gene mapping experiment in maize. He mapped genes on chromosomes based on the percentage of crossing over between different genes. One map unit corresponds to $1\%$ crossing over or recombination frequency. Based on the study of crossing over in maize, the scientist observed the following recombination percentages between genes $A, B, C,$ and $D$: $A$ and $D = 10\%$, $A$ and $C = 3\%$, $C$ and $D = 7\%$, $A$ and $B = 5\%$, and $C$ and $B = 8\%$. Based on these observations, determine the correct order of genes $A, B, C,$ and $D$ on the chromosome.