Board may also be used as a ï¬oor protector in. place of one layer of 3/8 thick millboard. For hearth extensions, see Speciï¬cation 3.6B. DUROCKÂ® Brand In addition to standard 1/2 DUROCK Brand Cement Board, DUROCKÂ® Brand Underlayment is available for ï¬oors and.
Genetic Blueprints. To map the chimp genome, researchers used DNA from the blood of a male common chimpanzee (Pan troglodytes) named Clint, who lived at the Yerkes National Primate Research Center in Atlanta. Clint died last year from heart failure at the relatively young age of 24. A comparison of Clint's genetic blueprints with that of the human genome shows that our closest living relatives share 96 percent of our DNA.
Because about a million years ago, in a human somewhere, two chromosomes fused. Over time, people with 46 chromosomes won out over people with 48. A close look at human and chimpanzee DNA shows that human chromosome 2 is very similar to chromosomes 12 and 13 of chimpanzees. At some point, chromosomes 12 and 13 fused together in human ancestors to create chromosome 2. It probably happened in a similar way to what happened with the 44 chromosome man.