General cytogenetics / J. Sybenga.

  • Sybenga, J. (Jacob), 1926-
Date:
1972
Catalogue details

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

Credit: General cytogenetics / J. Sybenga. Source: Wellcome Collection.

    14/384 (page X)
    X Contents 1.5. The karyotype 52 1.5.1. Karyotype. Idiogram. Karyogram 52 1.5.2. Constancy of the karyotype 63 1.5.3. Development of the karyotype. Cytotaxonomy 64 Chapter 2, Recombination 69 2.1. The exchange of DNA 69 2.1.1. Why recombination? 69 2.1.2. The mechanism of DNA exchange. Crossing-over 70 2.2. Crossing-over in prokaryotes 72 2.2.1. Viruses 72 2.2.2. Bacteria 74 2.3. Recombination in eukaryotes 75 2.3.1. Fungi. Yeasts 75 2.3.2. Alternation of generations 76 2.4. Reduction division. Meiosis 80 2.4.1. Function and description 80 2.4.2. Duration of meiosis 88 2.4.3. The two types of recombination 89 2.5. Segregation on the basis of chromosome recombination 89 2.5.1. Monofactorial segregation 89 2.5.2. Segregations involving more than one factor with chromosome recombination 95 2.6. Segregations involving crossing-over 101 2.6.1. Chiasmata and crossing-over in eukaryotes 101 2.6.2. The mechanism of exchange 105 2.6.3. Reciprocity of exchange. Conversion 111 2.6.4. Terminology: exchange, chiasma, crossing-over, recombination, link¬ age 112 2.7. Estimating recombination and crossing-over percentages 114 2.7.1. Test-cross 114 2.7.2. F2 115 2.7.3. Double crossing-over. Maximum crossing-over percentage 117 2.8. Interference 119 2.8.1. Chromatid interference. Chiasma interference 119 2.8.2. Coincidence 123 2.8.3. Negative interference 123 2.8.4. Interchromosome effects 123 2.8.5. Chiasma localization 124 2.9. Factors affecting chiasma formation and crossing-over 125 2.9.1. Interference and chromosome pairing 125 2.9.2. Temperature 126 2.9.3. Age 127 2.9.4. Water content 128 2.9.5. Sex 128 2.9.6. Heterochromatin 128