________ plays a role in determining skin color.
A. The HbS allele
B. Ultraviolet radiation
C. Sickle-cell anemia
D. Lactose intolerance
E. Lactose tolerance
Question 2
Some populations like the Polynesians, the San, or the people of southern India have phenotypes that do not fit neatly into standard racial categories, which suggests that
A. it is best to classify humans into a large number of racial categories.
B. phenotypical variation between human populations involves gradual shifts across different geographic zones.
C. these populations must have originated sometime before the major racial groups originated.
D. traditional concepts of race need to be reworked so that they are more exclusive.
E. there has been a lot of gene flow in the time since the origin of the three major human races.
A color-enhanced MRI image of the skull.
(A) Major leukocytes. (B) Enhanced color photograph from a scanning electron microscope of a ...
Signs and Symptoms of Radiation Exposure
Role of Factors of Production in Determining Growth, 1975–2009
A common autosomal recessive allele can produce a pedigree that looks like an autosomal dominant tra
What is the frequency of individuals that are homozygous for this allele?