72 



THE EEPOET OF THE 



No. 36 



Case IV. Eed-eyed (male) x Fi red-eyed (female) heterozygous. 

 RF rf 



Female 

 gametes 



EF 



rF 



same as the Fo. 



If a white-eyed male Drosophila is mated to a red-eyed female the offspring 

 *re red-eyed. "^^ these are in-bred all the F2 daughters are red-eyed, hut half the 

 sons are white-eyed. ''In a word, the grandfather transmits his characters visibly 

 to half of his grandsons but to none of his granddaughters.'' (Morgan.) 



R — dominant unit factor for red eye color, 

 r = recessive unit factor for white eye color. 

 F.F = sex factors in female. 

 F.f = sex factors in male. 



The experiments of Morgan and his colleagues with Drosophila are perhaps 

 the most important in recent genetic research. They are valuable both by reason 

 of the large number of specimens under observation and on account of the signi- 

 ficance of the results. Bateson says :_ " If we accept the whole scheme of interpre- 

 tation without reserve we are provided with a complete theory of heredity, so far as 

 proximate j)henomena are concerned.'"' 



LITERATURE ON INSECT INHERITANCE. 



Castle, W. E., " The Heredity of Sex."' Bull. Mus. Comp., Zool. Harvard, Vol. XL. No. 4, 



1903. 

 Coutagne, G., " Recherches Experimentales sur I'Heredite chez les Vers a Sole." Bull. 



Sci. de la France et Belgique. XXXVI. 1902. 

 Doncaster, L., and Raynor, G. H., " Sex Inheritance in the Moth Abraxas grossuJariata 



and its var. lacticolor.'' Rep. Evol. Com., IV., 1908. 

 Foot, K., and Strobell, iS. C, " A study of Chromosomes in the Spermatogenesis of 



Anasa tristis." Amer. Jour, of Anat., VII., 1897. 

 Henking, H., " Unters lib. d. ersten Entwickelungsvorgiinge in d. Eiern der Insekten." 



Z. Wiss Zool., 1890. 

 Kellogg, V. L., and Bell, R. G., " Studies of Variation in Insects." Proc. "Wash. Acad. Sc, 



VI., 1904. 

 Kellogg, V. L., " Variation in Parthogenetic Insects." Science, 24, 1906. 

 Lutz, F. E., " Note on Inheritance of Variations in Color-Pattern of Crioceris asparagi." 



Psyche, June, 1908. 

 McCracken, J., " A Study of the Inheritance of Dichromatism in Lina lapponica." 



Journ. of Exp. Zool., II., 1905. 

 Morgan, T. H., " Production of Two Kinds of Spermatozoa in Phylloxeras." Proc. Soc. 



Exp. Biol, and Med., V., 1908. 

 Morgan, T. H., et al., " The Mechanism of Mendelian Heredity." 1915. 

 Palmer, M. A., " Notes on Heredity in the Coccinellid Genus Adalia Muls." Annals Ent. 



Soc. Am., 1911. 

 Standfuss, M., " Handb. d. pal. Gross, schmetterl." 1896., Jena. 

 Stevens, N. M., "Study of the Germ Cells of Aphis rosce and ApMs oenothene." Jour. 



Exp. Zool., 1905. 

 Stevens, N. M., " Studies in the Germ Cells of Aphids." Cam. Pub., No. 51. 

 Stevens, N. M., " A Study of the Germ Cells of Certain Diptera." Jour, Exp. Zool., V., 



1908. 

 Tower, W. L., " An Investigation of Evolution in Chrysomelid Beetles of the Genus 



Leptinotarsa." Cam. Inst. Pub., No. 48, 1906. 

 Toyama, K., " On Some Silk-worm Crosses with Special Reference to Mendel's Law of 



Heredity." Bull. Coll. Agr. Tokyo. Imp. Univ., VII., 1906. 

 'J^ikon, E. B., "Studies on Chromosomes." Jour. Exp. Zool., II; 3, 1905; Jour. Exp. Zool., 



^T. 4, 1905; Jour. Exp. Zool., Ill, 1906. 

 V. ilsor. T' B., " Note on the Chromosome Groups of Metapodius and Banasa." Biol. 



Bj11„ XII, 1907. 



