Phenylketonuria is an inborn error of metabolism that is inherited as

One of the parents of a cross has mutation in its mitochondria. In that cross, that parent is taken as a male. During segregation of $F_{2}$-progenies that mutation is found in

Drosophila flies with one half of the body male and other half female is referred to as

In which one of the following combinations (a-d) of the number of the chromosomes is the present day hexaploid wheat correctly represented?

Linkage was first suggested by