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].
We have not yet been able to extract DNA from the bones of any australopithecine for comparison with modern human DNA. When we can do this, it is almost certain that we will discover many of their genes still in us today. Beginning around 2.5 million years ago or a bit earlier, there was a major forking in the evolutionary path of hominins.