Which scientist explained linkage and recombination in Drosophila?

When two genes are situated very close to each other in a chromosome,

The following experiment is the result of a dihybrid cross performed by Morgan. Identify the proportions of $P, Q, R,$ and $S$.

Which organism did $T.H. Morgan$ use in his experiments on linkage and recombination?

Linked genes are present on

In $Lathyrus$ $odoratus$,a hybrid blue-flowered and long-pollen plant is test-crossed with a homozygous recessive red-flowered and round-pollen plant. How many parental types are obtained when genes are present in the $cis$ stage in parents (in $\%$)?