In order to calculate the map distance of genes on a chromosome,one must know the:

Alleles of different genes that are on the same chromosome may occasionally be separated by a phenomenon known as

The lack of independent assortment of two genes $A$ and $B$ in the fruit fly $Drosophila$ is due to:

Which of the following was $NOT$ included in Mendel's laws?

There are three genes $a, b,$ and $c$. The percentage of crossing over between $a$ and $b$ is $20\%$,between $b$ and $c$ is $28\%$,and between $a$ and $c$ is $8\%$. What is the sequence of these genes on the chromosome?

Mendel did not recognize the linkage phenomenon in his experiments because