Author: iamdefinitory

Genetic Drift – Random changes in allele frequencies affecting human variation over generations.

Skin Pigmentation – A polygenic trait influenced by genetics and environmental factors, primarily controlled by melanin.

High-Altitude Adaptation – Genetic and physiological changes that allow certain populations (e.g., Tibetans, Andeans) to survive in low-oxygen environments.

Sickle Cell Trait – A genetic adaptation in certain populations that provides resistance to malaria but can lead to sickle cell disease.

Lactose Tolerance/Lactase Persistence – The ability to digest lactose into adulthood due to genetic adaptation in some human populations.

Melanin – A pigment responsible for skin, hair, and eye color, providing protection against UV radiation.

Gloger’s Rule – A principle stating that populations in sunnier regions tend to have darker skin pigmentation due to higher melanin production.

Allen’s Rule – A principle stating that individuals in colder climates have shorter limbs to minimize heat loss, while those in warmer climates have longer limbs for heat dissipation.

Bergmann’s Rule – A principle stating that individuals in colder climates tend to have larger body masses to retain heat, whereas those in warmer climates are leaner.

Acclimatization – Temporary physiological adjustments to environmental conditions (e.g., tanning due to sun exposure).