Humans share 98.8% of their DNA with chimpanzees. Because gene expression can be turned up or down-similar to the volume on your TV-the same gene can be turned to "high" in a human and "low" in a chimp. The human brain is larger and smarter than that of chimps and gorillas because, although we all have the same genes in the same brain region, these genes are expressed in different "volumes" or amounts. It is these differences that affect brain development and function.
Evolution is a gradual change in the DNA of a species over many centuries, occurring by natural selection when traits created by genetic mutations promote survival or reproduction in an organism.
By looking at global DNA studies, it is evident that human evolution hasn’t stopped, but is happening at a faster rate than before.
We often see similar facial appearances of family members in photo albums, observing how genes determine certain distinctive features in our bodies.
In-depth genetic knowledge and how our DNA is linked to facial appearance is a relatively new accomplishment by geneticists. 130 chromosomal regions which are associated with our facial shapes and features have been identified, in a comprehensive process involving scanning the DNA of 8000 participants.
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