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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
  • Title Page
  • Table of Contents
  • Back Cover
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    6 Patterns of inheritance I; which requires the vitamin biotin in order to grow is crossed to the wild type, equal numbers of biotin requirers and non-requirers occur among the progeny. Breeding programmes of this sort can be repre¬ sented formally as has been done in figure 2. Straightway something has been learnt about the process of in¬ formation transfer. No blending of the wild-type and mutant charac- green4:onidiospored yellow-conidiospored Aspergillus Aspergillus gamete gamete ' I ' zygote , ^, I ^ ascospore ascospore yellow-conidiospored green-conidiospored Aspergillus Aspergillus Figure 2. (For explanation, see above.) ters has occurred. The progeny do not have yellowy-green conidio- spores, but only either the original parental yellow or green colours. The progeny are said to show segregation of the two parental types. Note also that another possibility has not arisen, that is that no progeny occur which are capable of producing both yellow and green conidiospores. From this experiment it can be reasoned that ; (1) Each strain of Aspergillus contains with respect to the difference between the production of yellow and green conidiospores, only one type of information, that is it can either contain information leading to the production of yellow spores or to the production of green spores. (2) Since the zygotes give rise to equal numbers of ascospores of the two parental types, it is likely that the parents contributed equally to the zygote, that is the contribution of the two gametes to the zygote is equal. The zygote must therefore contain two types of genetic information with respect to the difference between yellow spores and green spores.
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