Population Genetics and the Hardy-Weinberg Principle
Population genetics analyzes allele frequencies in populations using the Hardy-Weinberg principle as a null model to detect evolutionary forces such as selection, drift, and migration.
Genetics
Autoimmunity and Hypersensitivity
Autoimmunity arises when the immune system mistakenly attacks self-tissues, while hypersensitivity encompasses excessive or inappropriate immune responses that cause tissue damage.
Immunology The Major Histocompatibility Complex
The major histocompatibility complex encodes MHC molecules that present peptide antigens to T cells, playing a central role in immune recognition, transplant rejection, and disease association.
Immunology
Emerging Viral Pathogens
Emerging viral pathogens are newly identified or re-emerging viruses that pose increasing threats to human health, often originating from animal reservoirs through zoonotic spillover.
Virology Influenza Viruses
Influenza viruses are negative-sense RNA viruses that cause seasonal epidemics and occasional pandemics through continuous antigenic drift and shift.
Virology
The Cytoskeleton: Structure and Dynamics
The cytoskeleton is a dynamic network of protein filaments that provides structural support, enables cell movement, facilitates intracellular transport, and drives cell division.
Cell biology Mitochondria and Cellular Energetics
Mitochondria are double-membrane organelles that generate ATP through oxidative phosphorylation and serve as central hubs for metabolism, calcium homeostasis, and apoptosis regulation.
Cell biology Epigenetic Regulation of Gene Expression
Epigenetic regulation refers to heritable changes in gene expression that do not alter the DNA sequence, mediated by DNA methylation, histone modifications, and non-coding RNAs.
Genetics Mutation and Genetic Variation
Mutations are permanent changes in DNA sequence that generate genetic variation, driving evolution and causing disease when they disrupt gene function.
Genetics