Science Progress Volume 7

Science Progress Volume 7

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1898 edition. Excerpt: ...analogous with that of P. monacha. 2 In both of these reciprocal crosses there is a slight preponderance of forms resembling the male parent--in the first instance lugens, in the second tau. This case is fairly analogous with that of the breed of Basset hounds lately investigated by Mr. Francis Galton ("The Average Contribution of each Several Ancestor," etc., Proc. Roy. Soc, 1897, pp. 401-413), where the reciprocal crosses of two colour-varieties show a male prepotency in the proportion of about six to five (loc. cit., Table I., p. 409). As in the instance of tau and lugens, there are no intermediate forms between 64 per cent. of lugens. In the 1890 broods, all of whose ancestors were lugens for two generations, the proportion of tau had fallen to a little over 11 per cent. in one and a little under the same figure in the other. In each of the five cases about twice as many females as males were of the tau form. Hence, as Standfuss puts it, it is more difficult to transform the female of Aglia tau than the male.1 5. Grammesia trigrammica Hufn. and do. ab. bilinea Hb.?. The female bilinea, taken by Gross at Garsten in Austria, laid eggs of which the male parent was presumably a normal G. trigrammica. Of the sixty-seven perfect insects that resulted, thirty-eight were trigrammica and twenty-nine bilinea. There were no intermediates. 6. Angerona prunaria L.?. and do. ab. sordiata Fuessl.?. This cross, procured by Zeller, gave seventeen prunaria and fourteen sordiata. 7. A. prunaria ab. sordiata S and A. prunaria?. This cross, also obtained by Zeller, gave eighty-four of prunaria to sixty-eight of sordiata, i.e., as in the reciprocal cross, about 55 per cent, of the type and 45 per cent. of the aberration. In neither of these more

Product details

  • Paperback | 178 pages
  • 189 x 246 x 10mm | 327g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 123664218X
  • 9781236642189