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DNA

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abbr. 脱氧核糖核酸（deoxyribonucleic acid）；（美国）国防部核子局（Defense Nuclear Agency）

考试真题

Some communities have agreed to share online—geneticists, for example, post DNA sequences at the GenBank repository ( ' , 库), and astronomers are accustomed to accessing images of galaxies and stars from, say, the Sloan Digital Sky Survey, a telescope that has observed some 500 million objects—but these remain the exception, not the rule.

Some communities have agreed to share online—geneticists, for example, post DNA sequences at the GenBank repository 库, and astronomers are accustomed to accessing images of galaxies and stars from, say, the Sloan digital Sky Survey, a telescope that has o

Yet most ancestry testing only considers a single lineage, either the Y chromosome inherited through men in a father’s line or mitochondrial DNA, which a passed down only from mothers.

This means that a DNA database may differ depending on the company that processes the results.

This DNA can reveal genetic information about only one or two ancestors, even though, for example, just three generations back people also have six other great-grandparents or, four generations back, 14 other great-great-grandparents.

More than two dozen companies sell DNA tests Directly to the public , ranging in price from a few hundred dollars to more than $2500.

DNA testing is also the latest rage many passionate genealogists-and supports businesses that offer to search for a family's geographic roots.

All tests require a potential candidate with whom to compare DNA.

Companies are unlikely to file many more patents for human DNA molecules - most are already patented or in the public domain.

Companies had won patents for isolated DNA for decades-by 2005 some 20% of human genes were patented.

DNA testing is also the latest rage among passionate genealogists—and supports businesses that offer to search for a family's geographic roots.

girls' attraction to pink may seem unavoidable, somehow encoded in their DNA, but according to Jo Paoletti, an associate professor of American Studies, it is not.

In October the Department of Justice filed a brief in the Myriad case, arguing that an isolated DNA molecule "is no less a product of nature... than are cotton fibres that have been separated from cotton seeds."

More than two dozen companies sell DNA tests directly to the public, ranging in price from a few hundred dollars to more than $2500.

This means that a DNA database may have a lot of data from some regions and not others, so a person's test results may differ depending on the company that processes the results.

Yet most ancestry testing only considers a single lineage, either the Y chromosome inherited through men in a father's line or mitochondrial DNA, which is a passed down only from mothers.