A: A blood moon is a deep reddening of the moon caused by the Earth passing between the moon and the sun. During the period of the eclipse, light from the sun... Full Answer >
Sometimes, bones are the only accessible source of DNA, thanks to their structure, which preserves DNA comparatively well and for a long time. The main problems of DNA extraction from bones are DNA degradation due to environmental factors and the presence of soil-derived inhibitors like humus acids [1â10].
Mitochondria are relatively sheltered inside the cell and the genetic material appears to survive where nuclear DNA becomes degraded easily. Mitochondrial DNA has been extracted from aged and degraded samples of hair, bones and teeth, where there just hasnât been enough decent nuclear DNA for analysis.