In the construction of chromosome maps,the evidence is derived mainly from

The phenomenon that acts against linkage is......

Which scientist explained linkage and recombination in Drosophila?

Genes $p, q,$ and $r$ are arranged on a chromosome. If the recombination frequency between $p$ and $q$ is $10 \%$,the recombination frequency between $q$ and $r$ is $20 \%$,and the recombination frequency between $p$ and $r$ is $10 \%$,what is the order of the genes on the chromosome?

What is the name of the pea species used by Bateson and Punnett in their experiments?

When the number of recombinant progeny is usually less than the number expected in independent assortment, it is called: