ANTHROPOLOGY CHAPTER 4 EXAM
Final Examination Questions & Answers with Verified Solutions
2026/2027
1. What is the central subfield of anthropology focused on Chapter 4's examination of
human biological variation and evolution?
A. Cultural Anthropology
B. Biological (Physical) Anthropology
C. Linguistic Anthropology
D. Archaeology
Rationale: Biological anthropology analyzes human biological diversity, evolutionary history, genetics,
primatology, and adaptation to environments.
2. Which mechanism of evolutionary change refers to random fluctuations in allele
frequencies within a population from one generation to the next?
A. Natural Selection
B. Gene Flow
C. Genetic Drift
D. Mutation
Rationale: Genetic drift causes random changes in allele frequencies, impacting small or isolated
populations most significantly (e.g. founder effect).
3. How do anthropologists explain the geographical variation in human skin
pigmentation?
A. Evolutionary balance between protecting folate from UV breakdown and
synthesizing sufficient Vitamin D
B. Direct adaptations to diet and regional water intake
C. Random genetic drift unaffected by environmental radiation
D. Social preferences for specific aesthetic traits across generations
Rationale: Skin color evolved as a balance: dark skin protects folate near the equator, while light skin
allows UV rays to synthesize Vitamin D in northern latitudes.
, 4. What is "gene flow" in evolutionary genetics?
A. Spontaneous alterations in nucleotide base sequences during DNA replication
B. The exchange of genetic material between interbreeding populations
C. Differential reproductive success based on environmental pressures
D. Chromosomal duplication errors during meiosis
Rationale: Gene flow occurs when individuals migrate and interbreed, introducing new alleles and
reducing genetic differences between populations.
5. Why do biological anthropologists reject the concept of biological human "races"?
A. Human biological variation is continuous (clinal) and shows more variation within
populations than between them
B. Genetic traits are identical across every human continent
C. Racial classifications were created by geneticists in the 21st century
D. Physical features like skull shape are determined entirely by diet
Rationale: Over 85-90% of human genetic variation exists within local populations; traits vary continuously
(clines) rather than forming distinct biological boundaries.
6. What evolutionary adaptation explains the high prevalence of the sickle-cell allele in
malaria-endemic regions?
A. Directional selection for homozygous recessive individuals
B. Heterozygote advantage (balancing selection) protecting against severe malaria
infection
C. High rates of genetic drift in high-altitude mountain zones
D. Cultural selection driven by traditional agricultural practices
Rationale: Heterozygotes carrying one sickle-cell allele resist malaria without suffering full sickle-cell
anemia, maintaining the allele in malarial areas.
7. What is "Allen's Rule" regarding human body proportions and climate adaptation?
A. Individuals in colder climates tend to have shorter, stockier limbs to conserve body
heat
B. Individuals in warmer climates have shorter limbs to prevent heat loss
Final Examination Questions & Answers with Verified Solutions
2026/2027
1. What is the central subfield of anthropology focused on Chapter 4's examination of
human biological variation and evolution?
A. Cultural Anthropology
B. Biological (Physical) Anthropology
C. Linguistic Anthropology
D. Archaeology
Rationale: Biological anthropology analyzes human biological diversity, evolutionary history, genetics,
primatology, and adaptation to environments.
2. Which mechanism of evolutionary change refers to random fluctuations in allele
frequencies within a population from one generation to the next?
A. Natural Selection
B. Gene Flow
C. Genetic Drift
D. Mutation
Rationale: Genetic drift causes random changes in allele frequencies, impacting small or isolated
populations most significantly (e.g. founder effect).
3. How do anthropologists explain the geographical variation in human skin
pigmentation?
A. Evolutionary balance between protecting folate from UV breakdown and
synthesizing sufficient Vitamin D
B. Direct adaptations to diet and regional water intake
C. Random genetic drift unaffected by environmental radiation
D. Social preferences for specific aesthetic traits across generations
Rationale: Skin color evolved as a balance: dark skin protects folate near the equator, while light skin
allows UV rays to synthesize Vitamin D in northern latitudes.
, 4. What is "gene flow" in evolutionary genetics?
A. Spontaneous alterations in nucleotide base sequences during DNA replication
B. The exchange of genetic material between interbreeding populations
C. Differential reproductive success based on environmental pressures
D. Chromosomal duplication errors during meiosis
Rationale: Gene flow occurs when individuals migrate and interbreed, introducing new alleles and
reducing genetic differences between populations.
5. Why do biological anthropologists reject the concept of biological human "races"?
A. Human biological variation is continuous (clinal) and shows more variation within
populations than between them
B. Genetic traits are identical across every human continent
C. Racial classifications were created by geneticists in the 21st century
D. Physical features like skull shape are determined entirely by diet
Rationale: Over 85-90% of human genetic variation exists within local populations; traits vary continuously
(clines) rather than forming distinct biological boundaries.
6. What evolutionary adaptation explains the high prevalence of the sickle-cell allele in
malaria-endemic regions?
A. Directional selection for homozygous recessive individuals
B. Heterozygote advantage (balancing selection) protecting against severe malaria
infection
C. High rates of genetic drift in high-altitude mountain zones
D. Cultural selection driven by traditional agricultural practices
Rationale: Heterozygotes carrying one sickle-cell allele resist malaria without suffering full sickle-cell
anemia, maintaining the allele in malarial areas.
7. What is "Allen's Rule" regarding human body proportions and climate adaptation?
A. Individuals in colder climates tend to have shorter, stockier limbs to conserve body
heat
B. Individuals in warmer climates have shorter limbs to prevent heat loss
