tetrasomy

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This then showed the way, and apparently the main if not the only way (aside from the far rarer phenomena of polyploidy and "tetrasomy"), by which the number of genes has become increased during the course of evolution.

Hermann J. Muller - Nobel Lecture 1964
It confirmed without doubt - she had Cat Eye Syndrome tetrasomy in every cell of her body.

Jodi Jacobson: Late-term Abortions: Facts, Stories and Ways to Help 2009