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771 results for "biological age" — page 20 of 39
Z_2_14 — Genetics of Longevity and Blue Zones
The genetics of human longevity — why some individuals live past 100 while most do not — is a field where heritability is modest, effect sizes are small, and environmental factors dominate, yet several genetic pathways h
Z_2_11 — Genetics of Immunity and MHC Diversity
The major histocompatibility complex (MHC) — known as the human leukocyte antigen (HLA) system in humans — is the most polymorphic gene region in the human genome, encoding cell-surface glycoproteins essential for adapti
Z_2_07 — Genetics of Disease Resistance
Infectious disease has been the most powerful selective force shaping the human genome, leaving signatures across thousands of loci. The best-understood example is sickle cell disease (HbS, Glu6Val in HBB): heterozygous
Z_2_05 — Gene Therapy: History and Progress
Gene therapy — the introduction, alteration, or replacement of genetic material within a patient's cells to treat or cure disease — has evolved from a speculative concept to an approved clinical reality over five decades
Z_1_06 — Sex Determination Genetics
Sex determination — the biological process that establishes whether an organism develops as male, female, or an alternative reproductive type — employs remarkably diverse mechanisms across the tree of life. In placental
Z_1_07 — Genetic Recombination and Crossing Over
Genetic recombination — the physical exchange of DNA segments between homologous chromosomes during meiosis — is a fundamental biological process that generates genetic diversity, ensures proper chromosome segregation, a
Z_1_08 — Transposons and Mobile Genetic Elements
Transposable elements (TEs, transposons) — segments of DNA that can move or copy themselves to new genomic locations — are among the most abundant and influential components of eukaryotic genomes. Discovered by Barbara M
Z_1_13 — DNA Repair Mechanisms and Genome Stability
Every human cell sustains an estimated 10,000–100,000 DNA lesions per day from endogenous sources alone — oxidative metabolism, spontaneous hydrolysis, replication errors, and reactive metabolites — while environmental m
Z_1_16 — Transposable Elements: Jumping Genes and Genome Evolution
Transposable elements (TEs) — sequences of DNA capable of moving ("jumping") from one genomic location to another — constitute approximately 45% of the human genome and up to 85% of the maize genome, making them the sing
Z_1_10 — Chromosome Evolution and Karyotype
Karyotype — the number, size, and morphology of chromosomes in a cell — varies enormously across species, from n=1 in the ant Myrmecia pilosula to n=630 in the fern Ophioglossum reticulatum. Humans have 2n=46 (23 pairs),
Z_1_11 — Polyploidy and Genome Duplication
Polyploidy — the possession of more than two complete sets of chromosomes — is a major force in genome evolution, particularly in plants and some animal lineages. Susumu Ohno (1970) proposed that whole genome duplication
Z_1_09 — Copy Number Variation and Structural Genomics
Copy number variations (CNVs) — segments of DNA ranging from ~1 kilobase to several megabases that are present in variable numbers across individuals — represent the most impactful form of genetic variation in the human
Z_4_01 — Human Microbiome, Gut-Brain Axis, and the Holobiont Concept
The human microbiome — the ~38 trillion microbial cells (bacteria, archaea, fungi, viruses) inhabiting the human body — constitutes a co-evolved ecosystem that profoundly influences health, immunity, metabolism, developm
K_3_09 — Minimal Consciousness and the Threshold of Sentience
Where does consciousness begin? This question — the problem of the threshold of sentience — is one of the most challenging in consciousness studies because it requires identifying what KIND of physical system is minimall
K_3_06 — Disorders of Consciousness: Coma, Vegetative State, and Minimal Consciousness
Disorders of consciousness (DoC) — coma, vegetative state (now termed unresponsive wakefulness syndrome/UWS), and minimally conscious state (MCS) — represent some of the most challenging clinical and philosophical proble
K_3_10 — Fetal and Infant Consciousness
The question of when consciousness emerges during human development — whether prenatally, at birth, or gradually through infancy — is one of the most consequential in consciousness studies, with direct implications for f
K_3_14 — Consciousness in Octopuses and Distributed Nervous Systems
Octopuses (Octopus vulgaris, O. bimaculoides, Abdopus aculeatus, and ~300 other species in order Octopoda) represent perhaps the most profound natural experiment in the evolution of consciousness: they are the most cogni
K_3_08 — Intention, Volition, and Motor Consciousness
The neural basis of voluntary action and the timing of conscious intention relative to brain activity has become one of the most productive — and philosophically consequential — research programs in consciousness studies
K_1_02 — Biocentrism and Observer-Dependent Reality
Biocentrism, proposed by Robert Lanza (stem cell biologist) and Bob Berman (astronomer) in 2009, argues that consciousness is FUNDAMENTAL to the universe — not an accidental byproduct of matter — and that the universe's
K_1_09 — Philosophical Zombies and the Hard Problem
The philosophical zombie (p-zombie) thought experiment, formalized by David Chalmers (1996), asks: Could there exist a being physically and functionally identical to a conscious human — identical atom for atom, processin
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