In a population of seals most of the seals have similar coloring however one seal has albinism. this seal is white and is almost completely blind what is most likely the cause of this difference from the rest of the population?

Albinism is caused by a genetic mutation in organisms. There could be two parents who have the regular number of cellular reproduction but still develop or produce an offspring that has this genetic anomaly. Albinism is caused by a defect in the melanin production of skin cells in organisms which causes little or no color on the pigments of the skin, hair, and eyes of affected organisms. 

The  answer is 1 amu.