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?
They are physiologically distinct
They are morphologically distinct
They cannot interbreed in nature
They are reproductively distinct
Lyon hypothesis deals with
Mongolism syndrome is caused by
Excessive growth of hair on the pinna is a feature found only in males because
Study of improvement of human race by providing ideal nature is
In which one of the following combinations (a-d) of the number of the chromosomes is the present day hexaploid wheat correctly represented?
Combination | Monosomic | Haploid | Nullisomic | TrisomicZ |