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A Century-Long Evolution of Genetics: From Mendel, Morgan, Watson-Crick to the New Tetramer Genetic Model

发布时间：

2026-11-13

A Century-Long Evolution of Genetics: From Mendel, Morgan, Watson-Crick to the New Tetramer Genetic Model

Sun Zuodong

Over more than a century of development, modern genetics has advanced through four pivotal cognitive phases: Mendel uncovered the statistical laws of inheritance; Morgan identified chromosomes as the carriers of genes; Watson and Crick revealed the double-helix structure of DNA; and the DNA-origami windmill tetramer model attempts to fill long-standing gaps in intergenerational information transmission within classical frameworks. It offers an underlying conceptual framework for understanding multi-generational familial inheritance, random phenotypic expression, and sex-linked genetic disparities.

Mendel is the founding father of modern genetics. Based on rigorous pea-hybridization experiments, he formulated the Law of Segregation and the Law of Independent Assortment, proposing that biological traits are governed by paired hereditary factors. Classical theory holds that when parents produce germ cells, paired hereditary factors segregate, with only one copy passed on to offspring. Progeny obtain one copy each from the father and the mother, forming new paired hereditary units. This “split-and-select-one” transmission logic satisfactorily accounts for the statistical ratios of traits observed in plant hybridization. Nevertheless, this system is confined to macroscopic phenotypic observation. It cannot fully explain complex genetic phenomena such as atavism (reappearance of ancestral traits across generations), nor accommodate the continuous accumulation and transmission of ancestral information. Hence it fails to give a complete account of how inheritance actually operates in humans and other eukaryotes.

Building upon classical genetic research, Morgan made major advances. Through systematic experiments on fruit flies, he confirmed that genes reside on chromosomes. He put forward the Law of Linkage and Crossing-Over as well as laws of sex-linked inheritance. He anchored abstract hereditary factors to tangible genes on chromosomes and elucidated the mechanisms of crossing-over, exchange and recombination of homologous chromosomes. This moved genetics from macroscopic trait observation to the cytological study of chromosomes. Even so, his theory retained the established logic of “half-dose transmission via germ cells”. It posits that ancestral genetic information is split and filtered during intergenerational transfer, and trait differences are explained merely by simple probabilities. It cannot illuminate the mechanisms behind human sex traits, random facial resemblance in individuals, or the formation of unusual intermediate phenotypes.

In 1953, Watson and Crick proposed the DNA double-helix model, unveiling the molecular architecture of genetic material and laying the cornerstone of modern molecular biology. The double-helix model clearly explained base-pairing rules and the semi-conservative replication mechanism of DNA, becoming the dominant paradigm for molecular genetics for decades. Yet this model still perpetuates the notion of “half-dose genetic transmission with selective loss of information”. It emphasizes the static replicative structure of DNA while neglecting epigenetic modification and dynamic remodelling throughout an organism’s lifespan. It does not fit well with the features of cumulative multi-generational inheritance and random phenotypic expression in eukaryotes.

Taken as a whole, classical genetic frameworks share a core shortcoming: they assume offspring inherit only half of their genetic information from each parent, while ancestral information becomes fragmented and lost in transmission. All individual trait variations and sex biases are attributed purely to random chance in germ-cell combinations. Classical genetics can observe outcomes but not explain underlying mechanisms. This constitutes the central bottleneck that has long prevented consistent interpretations of complex human familial inheritance, sex-related traits and rare intermediate phenotypes.

The DNA-origami windmill tetramer model re-conceptualizes intergenerational genetic transmission and establishes a mechanism for full-delivery of four sets of ancestral genetic information. Instead of receiving merely two sets of genetic information, progeny fully retain four core genetic modules derived from the paternal and maternal lineages. The father passes on intact two sets of genetic information originating from the paternal grandfather and grandmother, along with epigenetic modifications and traces of biological remodelling accumulated over his lifetime. Similarly, the mother transmits two complete sets from the maternal grandfather and grandmother, carrying imprints shaped by her own life processes. Human offspring therefore preserve a full closed-loop record of genetic information from four ancestral sources, with no fragmentary discarding or loss of information during transmission.

Randomness in an individual’s facial features, physique, physical constitution, personality and sexual characteristics does not stem from screening or discarding of genetic material. Instead, it arises from dynamically and randomly activated expression weights among the four ancestral genetic modules during individual development. For most people, sex-regulatory pathways show stable expression, giving rise to typical male or female phenotypes. In a small subset of individuals, simultaneous activation and imbalanced over-lap of male- and female-regulatory pathways produce intermediate or ambiguous traits. This can explain the diverse spectrum of sex- and physique-related variation observed in reality.

This model does not negate findings from classical experiments; it merely updates the logic governing genetic transmission and expression. It coherently unifies macroscopic inheritance rules, the chromosomal carrier mechanism and DNA molecular structure, pointing toward a promising new theoretical direction awaiting thorough experimental testing for studies on eukaryotic trans-generational inheritance, random phenotypic expression and biological evolution.