Hormones and heredity; a discussion of the evolution of adaptations and the evolution of species; . 0 UA/BARRED Q Homozygous. BARRED Q Heterozygous. Another case is that of tortoise-sliell, i,e, blackand yellow cats. The tortoise-shell with very rareexceptions is female, the corresponding male beingyellow, without any black colour. Doncaster foundthat a yellow male mated to a black female producedblack male offspring and tortoise-shell females. 118 ORIGIN OF SOMATIC When a black male is mated to a yellow female, thefemale kittens are tortoise-shell as before, but themales yellow. The Mendelian
Hormones and heredity; a discussion of the evolution of adaptations and the evolution of species; . 0 UA/BARRED Q Homozygous. BARRED Q Heterozygous. Another case is that of tortoise-sliell, i,e, blackand yellow cats. The tortoise-shell with very rareexceptions is female, the corresponding male beingyellow, without any black colour. Doncaster foundthat a yellow male mated to a black female producedblack male offspring and tortoise-shell females. 118 ORIGIN OF SOMATIC When a black male is mated to a yellow female, thefemale kittens are tortoise-shell as before, but themales yellow. The Mendelian hypothesis whichexplains these results is that the male is alwa^^sheterozygous, or has only one colour factor whetheryellow or black, and transmits these colours onlyto his daughters, while the female has twocolour factors, either BB, YY, or BY, Thus thecrosses are:— yocS. TOfirO/SJE-SHELL Q BO(S BLACkC O BLACK OBO 6 reiLOivQ
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Keywords: ., bookcentury1900, bookdecade1920, bookpublisherlondo, bookyear1921
