Bahamas Local, however, reports that a hurricane occurs about every three years with a major tropical storm every 12 years. Andros, Abaco and Grand Bahama are ranked in the top 10 places hit by tropical systems in the North Atlantic.
An example of a botanical genetic polymorphism is heterostyly, in which flowers occur in different forms with different arrangements of the pistils and the stamens. The system is called heteromorphic self-incompatibility, and the general 'strategy' of stamens separated from pistils is known as herkogamy.enetic polymorphism is actively and steadily maintained in populations by natural selection, in contrast to transient polymorphisms where a form is progressively replaced by another. By definition, genetic polymorphism relates to a balance or equilibrium between morphs.
Homologous chromosomes are chromosomes that contain the same genes but each originate from a different parent. There are two instances in meosis where this occurs, Prophase I: Synapsis of homologous chromosomes allows of cross-over of genes between mother and father chromosomes. This mixing gives rise to genetic variation. Metaphase I-Anaphase I: Disproportiante division of parental chromosomes (aka disjunction) allows for further genetic variation. The separation of the homologous chromosomes is random. That is, a daugther cell can have most of its DNA comprised by mother chromosomes, or mosty by father chromosomes, or somewhere between these two extremes (The other cell will of course have the complemetary set).