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Genetics / D.J. Cove.

  • Cove, D. J.
Date:
1971
Catalogue details

Licence: Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)

Credit: Genetics / D.J. Cove. Source: Wellcome Collection.

  • Front Cover
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  • Table of Contents
  • Back Cover
    205/228 (page 197)
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    Answers 197 vg mn + ^ vg mn + M i Fl : ^vg mn ^ vg mn (vg and mn recessive to +) ^ + + ^ + M F2 (phenotypes only given) : cJ gamete Ç gamete vg mn + mn vg M + M vg mn $ vestigial $ miniature 3 vestigial S miniature vg + 9 vestigial ? wild type ^ vestigial 3 wild type + mn $ miniature ? miniature S miniature S miniature + + - $ wild type ? wild type ^ wild type S wild type This gives F2 ratios of : $ : 3 wild-type : 3 miniature-winged : 2 vestigial-winged ^ : 3 wild-type : 3 miniature-winged : 2 vestigial-winged which is close to those obtained for the fourth pair. (iii) The third pair must be : vg + + + vg mn -t- M which give an Fi as follows: vg + vg mn $ and i.e. all wild-type + + + + ^vg+ vg m n , . . ^ and I.e. 1 : 1 for wild-type and mmiature. + M + M 12. (i) Ignoring shades of colour, the scheme can be resolved as follows : A or В X С 01 D -> coloured-flowered progeny Ax В ox С x D -> white-flowered progeny E X A, B, С ov D -> white-flowered progeny.
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