Sister Unions Research Articles

Differences in response of irradiated eggs and spermatozoa ofHabrobracon to anoxia

A study of dominant and recessive lethal and visible mutations induced in eggs and in spermatozoa ofHabrobracon by X-rays in atmospheres of air and of nitrogen demonstrates, that in nitrogen, (a) For eggs in metaphase I and in prophase I and for spermatozoa, all types of mutations are reduced. (b) For eggs in both stages, response of dominant and recessive lethal mutations is greater than for spermatozoa. (c) For eggs in metaphase I, dominant lethal mutations, apparently associated with iso chromatid breakage and lateral sister union, and with tension, conditions which prevent restitution, decrease in the same ratio as do recessive lethal and visible mutations.