79.
However, what’s more interesting is that redhead DNA mutation is recessive, which means it is hidden and can often skip generations without showing. At least 1.6 million Scots carry a red-head gene mutation, and most are unaware that they do. This is why a person who does not have red hair can still produce red-haired children if he or she is a carrier of this special DNA.
80.
The research on red hair, like many areas of science, is contradictory. In 2002 researchers showed that redheads are more sensitive to pain, and need more anaesthetic during surgery than people with blonde or dark hair. However, in 2005 scientists found that a MCR1R mutation gives redheads a higher tolerance for pain. Research into these aspects of red hair genetics continues. Redheads should though be more careful about their exposure to sunlight as they are at an increased risk of contracting skin cancer. If you are a redhead, the advice is not to stay out of the sun, but to be careful about how much exposure you get, and to cover yourself with a higher factor sunscreen.
76~80 DAFCB
(徐汇)
A. Don't neglect using the web.
B. Get your facilities ready.
C. Make paying for your items or service convenient.
D. Move forward and get started.
E. Put together a business plan.
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