#Genesis

• Agenesis — The congenital absence of an organ, tissue, or body part, caused by the failure of its development during embryonic life. Unlike aplasia, where the embryonic bud exists but fails to fully mature, in this severe structural anomaly the initial blueprint of the organ is completely missing from the genetic profile.
• Agenitalism — An extremely rare clinical condition characterized by the total congenital absence of internal and external genital organs or by the complete lack of hormonal secretion from the gonads (severe sexual infantilism). This endocrine and organic structural disorder profoundly affects the development of secondary sexual characteristics and reproductive capacity.
• Agenesis — A rare congenital malformation characterized by the complete absence, structural underdeveloped state, or congenital lack of an organ, tissue, or body part since the intrauterine development period. The phenomenon is caused by genetic errors or teratogenic factors manifesting during the early phases of organogenesis.
• Agrogeology — A branch of applied geology and agronomy that studies the link between geological structures, parent rocks, and the formation, composition, and fertility of agricultural soils. This science provides practical solutions for improving land quality by using crushed minerals and rocks as natural and ecological amendments.
• Allelogenesis — The evolutionary or biochemical process of formation, emergence, and differentiation of alternative forms of a gene (alleles) within the gene pool of a species. Structurally, allelogenesis occurs through point mutations, gene duplications, or successive molecular recombinations, constituting the primary source of gene polymorphism and variability upon which natural selection acts.
• Aleurolite — A consolidated detrital sedimentary rock formed through the cementation and diagenesis of aleurite (fine mineral dust, chiefly quartzous). The dimensions of its component grains are intermediate between those of sandstones and argillites, ranging from 0.002 to 0.06 millimeters. It often exhibits fine stratification and is used in geology to reconstruct ancient fossil or lacustrine sedimentary environments.
• Allobiogenesis — A hypothetical or experimental biological process describing the generation or evolution of life from a completely different environment or through mechanisms entirely foreign to standard carbon and nucleic acid-based terrestrial biochemistry. In astrobiology and theoretical biology, the concept investigates the structural parameters of alternative self-replicating systems that could function under extreme planetary temperature and pressure conditions.
• Allogenesis — A process of formation, development, or evolution determined by external factors or forces foreign to the internal structure of the analyzed system. In geology, it refers to the accumulation within a basin of sediments and minerals formed outside of it and mechanically transported; in biology, it defines a secondary evolutionary direction marked by specific adaptations to new local environments, without an increase in general structural complexity.
• Aloiobiogenesis — A biological process or evolutionary hypothesis describing the generation or emergence of living organisms or macromolecular structures under the exclusive action of external biochemical factors, completely foreign to the initial indigenous environment. This structural mechanism analyzes how organic compounds brought from the outside (such as through meteoritic impact or exogenous inputs) stimulated and dictated the first stages of biogenesis on Earth.
• Alloiogenesis — A hypothetical biological process or secondary evolutionary model describing the emergence or differentiation of living structures or tissues under the direct influence of modified, alternative, or exogenous biochemical or environmental factors. This structural mechanism analyzes deviations from typical biogenesis or standard ontogeny, explaining how variations in external stimuli can induce major functional reconfigurations in the early development of organisms.
• Alloisogenesis — A biological process or modality of embryonic development in which the formation and differentiation of tissues or organs exhibit structural deviations or alternating phases compared to the typical model of the respective species. This ontogenetic mechanism analyzes how environmental factors or early biochemical modifications induce parallel structural development pathways, leading to unique morphological variations without altering the core genome.
• Amphigenesis — A biological process of generating or arising a new organism through true sexual reproduction, requiring the equal participation and structural fusion of male and female reproductive elements (gametes). This phenomenon represents the evolutionary foundation of most higher organisms, being the opposite of asexual reproduction or clonal parthenogenesis.
• Amphitoky — A specialized form of deuterotokous parthenogenesis in which unfertilized eggs can spontaneously develop into individuals of both sexes (both males and females). This structural reproductive mechanism is encountered in certain insect species (such as some aphids or wasps) and represents a biological adaptation strategy for dynamic population regulation in the absence of amphimictic reproduction.
• Amphitoky — An accepted orthographic and phonetic variant for the term 'amfitochie'; it defines the biological process of amphitokous parthenogenesis through which unfertilized eggs give rise to individuals belonging to both sexes. It is a rare structural form used in some older dictionaries or treatises translated directly from French.
• Amphitoky — A rare form of parthenogenesis, equivalent to amphitoky or deuterotoky, through which unfertilized eggs can develop into individuals of both sexes (both males and females). This phenomenon represents a remarkable evolutionary adaptation found in certain arthropods, providing demographic balance to isolated populations by alternating genetic sex-determination mechanisms without male gametic contribution.
• Amphoheterogony — A complex form of alternation of generations (heterogony) in which parthenogenetic forms produce offspring of both sexes (both males and females) either sequentially or simultaneously. This structural reproductive mechanism combines the traits of sexual reproduction with amphitokous parthenogenesis to optimize species adaptability.
• Amyelia — An extremely rare and severe congenital malformation within the neural tube defects spectrum, characterized by the total absence or complete developmental arrest of the spinal cord. This severe structural anomaly occurs during the first weeks of embryogenesis due to the failure of the posterior neuropore to close, being incompatible with extrauterine life and often associated with other major cranial malformations.
• Amylogenesis — The biochemical process of formation and biosynthesis of starch within plant cells. Amylogenesis takes place inside the amyloplasts through the successive polymerization of glucose molecules, being an essential structural metabolic stage for storing energy derived from photosynthesis.
• Amniogenesis — The biological process of formation, differentiation, and structural development of the amnion and the amniotic cavity during the early stages of embryonic growth. This phenomenon is essential for ensuring the protective fluid environment required for the subsequent growth of the fetus in amniote vertebrates.
• Ammoniogenesis — The biochemical and physiological process of synthesis and production of ammonia or ammonium ions by the body's cells, located predominantly within the tubular cells of the kidneys. This cellular mechanism plays a fundamental role in maintaining the body's acid-base balance, allowing the excretion of excess hydrogen ions by binding them as ammonium in the urine.