The study of abnormalities produced by iiiutaiit genes which a r e lethal in liomozygous condition forms a convenient iiiethod for the analysis of mammalian developmental plienomena. A lethal gene acts during development as a n esperimeiit carried out by the gene wliich causes a developiiieiilal disturbaiice a t a certain point (Gluecksohn-Sclioenlieimer,
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