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
One -third of the progenies
None of the progenies
All of the progenies
Fifty per cent of the progenies
Linkage group is
The reduction of one pair of chromosome in human is due to
Mendel proposed which of the following term for hereditary units
Hugo de Vries formulated the “Mutation Theory'' based on the experiments he conducted on
Nicotiana sylvestris flowers only during long days and $N$.tabacum flowers only during short days, if raised in the laboratory under different photoperiods, they can be induced to flower at the same time and can be cross fertilized to produce self-fertile offspring. What is the best reason for considering $N .$ sylvestris and $N$. tobaccum to be separate species?