MODERN HUMAN VARIATION
I. Causes of Human Variation
A.
1. Genetic changes that give their carriers a better chance of survival
and reproduction
a.
B.
1. short-term changes in physiology that occur in an organism in
response to changes in environmental conditions.
a.
b.
C.
1.
II.
A.
1. Bergmann’s Rule: Slender animals live in warmer climates and
robust animals live in cooler climates.
2.
B.
1.
a. pigment in skin, hair, and eyes
2.
1
a. Generally, animals living in cooler climates tend to have less
melanin that population living in warmer climates.
C.
1.
a.
b. homozygous for sickle-cell anemia have heart, lung, or brain
damage.
c.
III.
A.
1. A subspecies differing geographically, morphologically, or
genetically from other members of the species.
B.
1.
2.
C.
1. as humans we tend to place people into groups- us and them.
2.
IV.
A. gradual change in the frequency of an allele or trait over space
1.
2