Imagine a thickBook of Life. In the early 20th century, Morgan's experiments on fruit flies found the "pages" for us β he demonstrated that genes are arranged linearly on chromosomes. Yet, for half a century, the scientific community was misled about what "ink" these words were written in.
The Complexity Paradox: Why Was DNA Underestimated?
At the time, it was believed that life's diversity must be carried by equally complex substances. Proteins are made of20 amino acids, with nearly infinite combinations; while DNA consists of only4 bases. Under this logic, DNA was mistakenly regarded as merely an "inert scaffold" maintaining chromosomal structure.
A Shift in Logic
However, the precise continuity of life across generations hinted at another possibility: genetic material must possess highstabilityandaccurate replication capability. The halving of chromosome numbers in meiosis and their restoration through fertilization β this highly ordered physical process ultimately steered scientists away from complex proteins toward the seemingly "simple" DNA.