The Inheritance of Quantitative Characters
Up to now, we have studied qualitative characters which could manifest themselves in a limited number of different states: for example, the blood groups (an individual can be A, B, AB or O), or sensitivity to PTC (an individual can be a taster or a non-taster). But there are many characters for which individuals cannot be classified into a definite number of types, but can only be characterised by measurement. For example, height, or head circumference or body-weight, are characters of this sort.
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