Question

When you are exposed to sunlight for a long time, your skin, which otherwise appears normal, gets heavily tanned. What could be the reason?

Answer 1

The genes for melanin pigmentation remain turned on and prepare more melanin than usual to protect the skin from photo-damage when it is exposed to sunlight for long time.



The genes for melanin pigmentation remain turned off and synthesize more melanin than usual to protect the skin from photo-damage when it exposed to sunlight for a long time.



The genes for melanin pigmentation are switched off to stop the synthesis of melanin to protect the skin from photo-damage when it is exposed to sunlight for a long time.

Answer 2

http://www.pa.msu.edu/sciencet/ask_st/071493.html