When closely placed genes on the same chromosome are inherited together,the phenomenon is known as:

Morgan and his group observed that when genes are grouped on the same chromosome,some genes are very tightly linked and show:

Who coined the term 'linkage'?

Which of the following statements is $NOT$ true for two genes showing $50\%$ recombination frequency?

The map distance between genes $A$ and $B$ is $3$ units,between $B$ and $C$ $10$ units,and between $C$ and $A$ $7$ units. The order of the genes in a linkage map constructed on the above data would be:

When a test cross is performed between $F_1$ hybrid flies,the parental type offspring are produced in much higher frequency than the recombinant type offspring. What does this indicate?