Polytene chromosomes in salivary glands of Drosophila are formed as a result of
Polytene chromosomes in salivary glands of Drosophila are formed as a result of
- A
Endoduplication
- B
Duplication without separation
- C
Replication of $DNA$ without cell division
- D
All the above
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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?
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?
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Crossing over that results in genetic recombination in higher organisms occurs between
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- [AIPMT 2004]
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