. The elements of genetics. Genetics. ORIGINS OF GYNANDROMORPHS. Fig. showing the modes of origin of gynandromorphs in different insects directly observed in the egg or inferred from the genetic character of the two sides of the body which are of opposite sex. In Bombyx (after Goldschmidt and Katsuki, 1931) two sperm may fertilize the two dissimilar products of the second meiotic division in the XY female. In Habrobracon (after Whiting, 1943) a sperm may fertilize one of the products of the second meiotic division to give a diploid temale side, a haploid and parthcnogenetic male s
. The elements of genetics. Genetics. ORIGINS OF GYNANDROMORPHS. Fig. showing the modes of origin of gynandromorphs in different insects directly observed in the egg or inferred from the genetic character of the two sides of the body which are of opposite sex. In Bombyx (after Goldschmidt and Katsuki, 1931) two sperm may fertilize the two dissimilar products of the second meiotic division in the XY female. In Habrobracon (after Whiting, 1943) a sperm may fertilize one of the products of the second meiotic division to give a diploid temale side, a haploid and parthcnogenetic male side being derived from the other product. More rarely a second sperm may cleave side by side with the fertilized egg. In Drosophila one of the two X's in a fertilized female egg may be lost at the first cleavage division to give an XO side which is morphologically male (after Morgan, Bridges and Sturtevant, 1925). More rarely two sperms, one X- and the other Y-bearing, may fertilize the two first products of cleavage to give a perfect gynandromorph. Thus all the different irregularities occur which will give workable results in each organism. LkmcnU of Gaieties 113 II. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Darlington, C. D. (Cyril Dean), 1903-; Mather, Kenneth. New York : Macmillan
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