A-LevelBiologyInherited changeMay/June 2019Paper 4 Q215 Marks
The interpupillary distance (IPD) is the distance in millimetres between the centres of the pupils of the eyes. Fig. 2.1 shows how IPD is measured. [Figure 2.1] IPD is one example of a characteristic of human facial structure that shows variation. Fig. 2.2 shows the pattern of variation in IPD in a large sample of adults. [Figure 2.2]
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