Literally meaning: half double, single
Origin: Anc Greek
ημι-/hemi(=prefix meaning half)
ζυγωτία/zygotia(=zigosity meaning the state of genes for a trait in diploids) > ζυγός/zygos(=yoke, doubled)
In 1905 by by British geneticist W Bateson (1861 –1926)
Hemizigosity is the state of having only one of a pair of alleles as genes alleles on the single X chromosome in the human males.