Heredity and sex . V/ V. -<»//,/? o Fig. 107. — Non-disjunction of the sex chromosomes. In consequencea female produces three instead of one class of eggs (see to right of diagram)with respect to X. The results of the fertilization of such a female bya normal red male are shown in the lower part of the diagram. sperm will make a male if it enters an egg from whichboth sex chromosomes have been removed. It istherefore not the female-producing sperm, as such,that gives a female under normal conditions, but thissperm plus the sex chromosome already present inthe egg that gives an additive resu
Heredity and sex . V/ V. -<»//,/? o Fig. 107. — Non-disjunction of the sex chromosomes. In consequencea female produces three instead of one class of eggs (see to right of diagram)with respect to X. The results of the fertilization of such a female bya normal red male are shown in the lower part of the diagram. sperm will make a male if it enters an egg from whichboth sex chromosomes have been removed. It istherefore not the female-producing sperm, as such,that gives a female under normal conditions, but thissperm plus the sex chromosome already present inthe egg that gives an additive result — a female. (4) In the group of nematode worms belonging es-pecially to the genus Rhabditis, there are some extraor- to 1000 females SPECIAL CASES OF SEX-INHERITANCE 225 dinary perversions of the sex ratios. The table givesthe ratios that Maupas discovered. Not only are the Diplogaster robustus male Rhabditis guignardi male Rhabditis dulichm-a male Rhabditis caussaneli ...... males Rhabditis ely
Size: 2114px × 1182px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., boo, bookcentury1900, bookdecade1910, booksubjectsex, bookyear1913
