________ 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.
Measles. A photograph of a child stricken with measles, showing the tell-tale sign of the skin rash.
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Pin the skin and subcutaneous fascia on a spot on the back using the thumb of one hand; place the ...
Color-enhanced electron micrograph of E. coli undergoing cell division
The outcome of a mating between individuals heterozygous at two genes determining their ABO blood ty
The frequency distribution of the allele in Africa, Southern Europe, the Middle East