Thomas Hunt Morgan worked on which of the following organisms?

What is the result of linkage and crossing over?

Who mapped the position of genes on chromosomes by using the frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes?

For the preparation of genetic maps,the recombination frequencies between genes are additive over short distances but not over long distances due to

Generation of non-parental gene combinations is termed as

The recombination frequency between the genes $a$ and $c$ is $5\%$,$b$ and $c$ is $15\%$,$b$ and $d$ is $9\%$,$a$ and $b$ is $20\%$,$c$ and $d$ is $24\%$,and $a$ and $d$ is $29\%$. What will be the sequence of these genes on a linear chromosome?