In the fruit fly $Drosophila$,the lack of independent assortment between genes $A$ and $B$ is due to .....

Linked genes are separated by:

In a certain plant, red flowers $(R)$ are dominant to white flowers $(r)$ and tallness $(T)$ is dominant to dwarfness $(t)$. $A$ heterozygous plant $(RrTt)$ is backcrossed with a double recessive plant $(rrtt)$. If the gene loci for colour and size are situated very close together on the same chromosome, the expected percentage of offspring could be approximately:

Tall Red

Tall White

Dwarf Red

Dwarf White

respectively.

Which characteristic does not support Mendel's Law of Independent Assortment?

Discuss why Drosophila has been used extensively for genetical studies.

Linkage with increasing age becomes ......