5 topics with brief reviews: definitions, key facts, and class questions.
In this section, we examine the period of human life from birth to natural death. Postnatal ontogenesis is not simply physical growth, but a complex cascade of genetic, molecular, and physiological changes that determine the quality and duration of life.
We will begin with the homology of early development genes to demonstrate the evolutionary continuity of organism formation. Next, we will study in detail the periodization of postnatal development, the fundamental mechanisms of aging, and its genetic theories. Special attention is paid to progeria, a syndrome of premature aging that serves as a crucial clinical model in modern gerontology.
In practical classes and exams, examiners most frequently ask about the molecular mechanisms of cellular aging (such as the telomere theory) and the critical periods of postnatal ontogenesis. A fundamental understanding of these topics is essential for the further study of age physiology, pediatrics, and geriatrics.
These are homologous (related) gene families. The only difference is the organisms: the Hom-family describes Drosophila genes, while the Hox-family describes analogous genes in mammals.
What are acceleration and retardation in human biology?
These are variants of deviation of biological age from chronological age. Acceleration means the speeding up of growth and maturation under favorable conditions, whereas retardation means delayed development triggered by adverse environmental factors.
Is old age a pathology that needs to be treated?
No, from a medical and biological perspective, old age is a natural stage of individual development (ontogenesis), not a disease. Medicine treats concomitant pathological processes, not aging itself.
At what age does childhood progeria manifest?
Hutchinson-Gilford syndrome begins to manifest by the age of 3 years. Prior to this time, the child's early development proceeds without abnormalities.
What is the Hayflick limit?
This is the genetically programmed maximum number of divisions (mitoses) that a cell can undergo before reaching crisis.
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