Spectrograph

An instrument used to disperse or separate the light into all its wavelengths which allows quantitative measurements of intensity to be made. As an instrument on a telescope, the spectrograph obtains the spectrum of the light from the astronomical objects. Each spectrum contains a wealth of information. For instance, each chemical element has a distinctive spectrum, which varies with temperature. By analyzing the spectrum of a star astronomers can learn about its chemical composition, its temperature.

Categorical Trait

A trait in which phenotypes are expressed in categories.

Somatic Doubling

A disruption of the mitotic process that produces a cell with twice the normal chromosome number.