Word: triploids
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...took place. In the first scenario, the egg might have divided in two (without separating) and then each part fertilized by one sperm. Egg division before fertilization is very rare, says Minkin. The second, more likely possibility is that the egg fused with two sperm cells and created a triploid cell. Then, at the second-cell stage, each shed the chromosomes from each of the sperm - or did something to correct its chromosomal count, says Souter. "There are a whole host of potential mechanisms to explain this," she says, "but we really just don't know. We do know there...
...There is no end to our effrontery. In Arizona a mutant Chinese grass carp, the sterile triploid amur, has been released into the ponds and water hazards of golf courses to keep the water free of entangling weeds lest golf balls be lost or the scenery spoiled. An African fish, the tilapia, cruises irrigation canals devouring any growth that might impede the water flow, but it endangers the Colorado River's sport fish. Coast to coast, European starlings darken the skies. A century ago, the first few were released in New York City by a reader of Shakespeare bent...
...farmed, fish are not subject to continuous government inspection. About eight therapeutant drugs and some 30 other chemicals are allowed in the cultivation of fish, according to the U.S. Fish and Wildlife Service, and antibiotics are used extensively even in the genetic restructuring of some species. For instance, the triploid oyster, still in the experimental phase, is rendered sterile with antibiotics and thus does not go through an uneatable mating phase; it is harvestable all year. On the other hand, wild fish are vulnerable to parasites, PCBs and a host of other pollutants...
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