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 perhaps be
$A, B, C$
$A, C, B$
$B, C, A$
$B, A, C$
Morgan hybridised yellow-bodied, white-eyed females to brown-bodied, red-eyed males and intercrossed their $F_{1}$ progeny. He observed that
$(a)$ $F_{2}$ ratio was deviated very significantly from the $9 : 3 : 3 : 1$ ratio
$(b)$ Both genes did not segregate independently of each other
$(c)$ Recombinant types are not obtained in $F_{2}$ generation
$(d)$ Both genes segregate independently of each other
Select the correct set of statements :
The frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes was explained by
If gene exchange rate is $30\%$ of the two linked genes, then the distance between these two genes is
What map unit (Centimorgan) is adopted in the construction of genetic maps?