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XYY syndrome

 a chromosomal abnormality where there are three sex chromosomes. People who possess this abnormality are males who are of above average height with typically low levels of fertility. There used to be considerable interest in the possible links between this condition and aggressive behaviour, although this has never been proven.

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Psychology term of the day

October 18th 2021

shape constancy

refers tothe tendency to perceive the shape of an object, despitevariations in the size of the retinal image.