Tuesday, April 6, 2010
Allo + polyploidy = Allopolyploidy
Jerry Coyne describes allopolyploid speciation as speciation that occurs due to the “hybridization of two different species that live in the same area” (Coyne 186). It occurs in plant species with regularity, producing a new species that contains the added number of chromosomes of the parents that produced it. It also happens in animal species; however, it occurs far more rarely. What do plants have that animals don’t that allow them to develop allopolyploid species? If an animal were to develop allopolyploidally, how could it develop a new species, being that no other examples of the allopolyploid animal would be able to mate with the original organism? Since plants develop allopolyploidally relatively often, what might the reasons be that plants with thousands of chromosomes don’t exist, given that one allopolyploid species could mate with another?