Inversion polymorphism in common green pigeon, Treron phoenicoptera (Latham)(aves).

The basic karyotype of common green pigeon, Treron phoenicoptera consists of seven pairs of macrochromosomes and thirty pairs of microchromosomes. In the population examined by us, there exists an interesting chromosomal polymorphism. Chromosomes 1 and 2 both exist in a dimorphic form. The dimorphism in each case appears to be due to the presence of a pericentric inversion. Chromosome 1 exists in 1m and 1st conditions and chromosome 2 in 2st and 2m conditions. The significance of this intrapopulation variation is discussed.