The model that showed different degrees of coiling in metaphase chromosomes using electron microscopy was called Folded Fibre.
Electron microscopy: A microscope that uses an accelerated electron beam to illuminate is called an electron microscope. Since the wavelength of an electron can be up to 100,000 times shorter than that of visible light photons, electron microscopes can disclose the structure of smaller objects and have a higher resolving power than light microscopes. A scanning transmission electron microscope has achieved more than 50 pm resolution in annular dark-field imaging mode and magnifications of up to roughly 10,000,000. In contrast, conventional light microscopes are limited by diffraction to about 200 nm resolution and usable magnifications below 2000.
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