Xeroderma pigmentosum is a severe, genetically linked skin cancer in which dna repair mechanisms are impaired. why would sufferers of this condition need to stay out of the sun?

Alaska and northern canada have a diet rich in vitamin d and their skin color is darker than predicted on the basis of iv intensity at their latitude. explain the observation:

Based on the data in your tables, did the light-colored moths have a higher or lower survival rate after the industrial revolution?

The allele for curly hair is incompletely dominant. if a mother is homozygous for curly hair and the father is homozygous for straight hair, what percentage of the offspring will exhibit characteristics of both parents? 25 percent 50 percent 75 percent 100 percent