Polytene chromosomes in salivary glands of Drosophila are formed as a result of
Endoduplication
Duplication without separation
Replication of $DNA$ without cell division
All the above
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?
Who proposed the term 'Allelomorph'
Crossing over that results in genetic recombination in higher organisms occurs between
Which of the following human diseases provides an example of sex linked inheritance
Study of human race is called