Contemporary Human Diversity

The concept of race

A biological fallacy; race is not a valid biological classification.

Human Variation

The diversity of biological traits among humans, influenced by evolution and adaptation.

Biocultural approach

Recognizes the interplay between biological and cultural factors in human development.

Adaptability

The capacity to maintain functions in response to environmental stressors.

Polytypism

The existence of multiple types or varieties within a species.

Genetic diversity

The variation of genes within a population, greater within populations than between them.

Polymorphism

The presence of multiple forms or traits in a population.

Clines

Gradual changes in trait prevalence over geographical areas.

Adaptive significance

The relevance of a trait for survival and reproduction in a particular environment.

Skin pigmentation

The amount of melanin in the skin, influencing color and adaptation to UV radiation.

Vitamin D hypothesis

The idea that lighter skin facilitates Vitamin D production in low UV environments.

Folate Degradation Argument

Darker skin provides protection against UV radiation, safeguarding folate levels.

Hypoxia

Insufficient oxygen availability in body tissues, particularly at high altitudes.

Acute Mountain Sickness (AMS)

A condition experienced due to reduced oxygen levels at high altitudes; symptoms include headaches and nausea.

High Altitude Cerebral Edema (HACE)

Fluid accumulation in the brain at high altitudes, potentially life-threatening.

High Altitude Pulmonary Edema (HAPE)

Fluid buildup in the lungs at high altitudes, obstructing oxygen transport.

EPAS1 gene

A gene that helps regulate hemoglobin levels in response to low oxygen environments.

Malaria carrier and sickle cell allele

Heterozygotes for sickle cell are better at resisting malaria but not perfectly adapted.

Lactase persistence

The continued production of lactase into adulthood, enabling milk digestion.

Biological Responses to Hypoxia

Physiological adaptations to improve oxygen transport and utilization at high altitudes.

Population clusters

Broad geographical groups that exhibit distinct biological traits.

Cultural adaptation

Changes in human behavior and technology in response to environmental pressures.

Environmental stressors

Challenging conditions in an environment that require adaptation.

Behavioral changes

Modifications in human activity in response to environmental challenges.

Selective pressure

The environmental factors that influence the survival and reproduction of organisms.

Interbreeding implications

The genetic exchange between different human populations or species.

Human evolutionary processes

The ways in which human beings have changed over time through social and biological mechanisms.

Cultural influences on biology

How human decisions and culture shape biological traits and adaptations.