Hormones and heredity; a discussion of the evolution of adaptations and the evolution of species; . ^VH/r££y£D c5 Off. \ - 00 10 Off, Iff, WH/T£ £y£D n P£D £Y£0 Q WHITE£y£D Q P£D £y£D O Homozygous. Heterozygous. Homozygous. Heterozygous. SEX-CHARACTERS IN EVOLUTION 115 it is thus of no more importance than the absenceof an X cliromosome which occurs in those caseswhere the male has one sex - cliromosome andthe female two. According to the researches ofvon Winiwarter^ on spermatogenesis in man, thelatter is actually the case in the human investigator found that there were 48 chromo
Hormones and heredity; a discussion of the evolution of adaptations and the evolution of species; . ^VH/r££y£D c5 Off. \ - 00 10 Off, Iff, WH/T£ £y£D n P£D £Y£0 Q WHITE£y£D Q P£D £y£D O Homozygous. Heterozygous. Homozygous. Heterozygous. SEX-CHARACTERS IN EVOLUTION 115 it is thus of no more importance than the absenceof an X cliromosome which occurs in those caseswhere the male has one sex - cliromosome andthe female two. According to the researches ofvon Winiwarter^ on spermatogenesis in man, thelatter is actually the case in the human investigator found that there were 48 chromo-somes in the female cell, 47 in the male; afterthe reduction divisions the unfertilised ova had24 chromosomes, half the spermatids 24 and half23, so that sex is determined in man by thespermatozoon. Morgan believes that the heredity of haemophilia(the constitutional defect which prevents the spon-taneous cessation of bleeding) follows the samescheme, and also at least some forms of stationarynight-blindness — that is, the inability to see intwilight. We may mention a few other cases in animals,refer
Size: 3225px × 775px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, bookpublisherlondo, bookyear1921
