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Evolution
Speciation: Polyploidy
1 question from 1 paper, each with its answer.
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Concepts tested
- Instant speciation by polyploidy
All Questions
2002 AIPMT 1 question
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Reason of fast speciation in present day crop plants is -Polyploidy is the presence of more than two sets of chromosomes in a cell.
A polyploid plant usually cannot produce fertile offspring when crossed with its parent species, so it is reproductively isolated at once. A new species can arise in a single generation.
Many crop plants are polyploids, e.g. wheat (hexaploid, 6n), cotton, potato, banana and sugarcane. Polyploidy also gives larger plants, fruits and seeds.
So the reason for fast speciation in present day crop plants is polyploidy.