Address on heredity in relation to insanity, given to the members of the London County Council, at the County Hall, S.W., on June 26th, 1912 / by F.W. Mott.

  • Mott, F. W. (Frederick Walker), 1853-1926
Date:
[1912?]
Catalogue details

Licence: In copyright

Credit: Address on heredity in relation to insanity, given to the members of the London County Council, at the County Hall, S.W., on June 26th, 1912 / by F.W. Mott. Source: Wellcome Collection.

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    <» white predoiniinint. It the blacks of this second liybvid g-enerati(jn fUt inated with blacks only blacks will be prodnced; likewise, if the whites arc* mated with whites only whites will be produced; while if the blue aic. mated again we shall have in the third generation the proportion of tw(j blues, one black and one white. Now the blacks and whites are legaidcd as wasters ” by the breeders, consequently it would be-more profitable to cross a black with a, white fowl to produce all hybrids. the black fowl is only partially dominant to the white, and differs therefore from the tall pea, which is completely dominant. The blue colour of the fowl may be reo-arded as an intermediate between the black and white; the important point to notice, however, is that the hybrid, whether of the first, second, or third generation, or any future generation, is distinguishable from both parents of the cross, not only by the results of the cross-breeding, but by Fiy. 0.—Pedigree showiiiy; polydactylism. Black circles indicate polydactylisin, and circles with black centres -partial polydactylisin. The chart is very suggestive of Mendelism. visible characteristics. ^^For fifty years the blue Andalusian has been bred, and it comes true to type no more now than when the attempt to fix it began (Davenport). In a discussion on heredity and disease at the Koyal Society of Medicine the two greatest authorities on heredity in this country—Professor Karl Pearson and Professor Bateson—took part. Ifiie latter said : “ I think I shall have no difficulty in showing you that the conclusions to which iNfendel came are applical)le in many cases to the descent of disease or congenital deformity in man.^’ Prof. Pearson, while admitting the import- ance of the work of Mendel and his followers, stated that it was limited to the observation of segregation of characters in the germ. Perhaps the oidy example of Mendelism in the human subject that can be cited as showing dominant and recessive characters in thr» ju-oiiortions found by