NEET 2003 Biology question
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. tabacum to be separate species : -
Solution
The biological species concept defines species as groups of interbreeding natural populations that are reproductively isolated from other such groups. Here, although flowering can be synchronised artificially in the laboratory (and then they can cross), in nature the two species flower in different seasons (long day
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