Word: geneses
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Over the past several years, China has ramped up its textile production and reduced prices (igniting trade tension with the U.S.). Many of the cashmere garments, however, are not made wholly of the downy undercoat of the goat, where the fibers are long and fine. Occasionally these fibers get mixed...
“Our objective is really to find new genes. The zebrafish has a particularly beautiful retina—it has four types of cones, and then the rods—which is more than even in humans,” he adds.
He says zebrafish are particularly ideal subjects because a biologist can use them for “forward genetics”—identifying genes by inducing mutations and then finding the specific gene related to the produced phenotype, or appearance.
In a vivid demonstration, Dowling attaches GFP protein to the promoter regions of photoreceptor genes, so that a highly fluorescent protein is produced. This serves as a marker for how the rod cells develop and, as Dowling notes, “it enables us to find mutants who have specific...
Why are the Weisses so vulnerable to Alzheimer's? One reason is that they tend to live long lives; advanced age is a major risk factor for late-onset Alzheimer's. But scientists are convinced that defective genes are also involved. Four have already been located--one known as ApoE...