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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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  • Back Cover
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    haploid organisms 9 would be so. It might have been that not only the information affecting a single character but also the entire parental genomes remained separated in the zygote with no opportunity for mixing to occur. yellow-conidiospored Aspergillus with normal growth rate gamete green-conidiospored slow-growing Aspergillus gamete Í ascospore yellow- conidiospored, normal growth rate i ascospore zygote green- conidiospored, slow-growing ascospore I green- conidiospored, normal growth rate ascospore yellow- conidiospored, slow- growing parental types recombinant types Figure 4. (For explanation, see opposite.) Since all four classes of progeny resulting from a two character cross occur at equal frequencies, it can be argued that in the re- assortment of genetic information which takes place during the reduction division by which the zygote gives rise to ascospores, information for each particular character is distributed independently of information for other characters. In other words, it can be said that genes for different characters assort independently. This point be¬ comes clearer when the cross is represented symbohcally (see figure 5). It will be seen later however that not all pairs of genes segregate independently of one another (see Chapter 3, Linkage and the chromosome theory). From now on, a more informative type of gene symbol will be used. Unfortunately various different forms of genetic symbolism are in use for different organisms. The most common form, which
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