The Evolution of Genetic SystemsThe University Press, 1939 - 149 páginas Premises of genetics; The substances of hereditary; Sexual reproduction; Meiosis: pairing and crossing-over; Meiosis: the process of assortment; Change of quantity: poly-ploidy; Change of position; Hybrids: diploid and polyploid; Change of proportion; The atom of genetics; Chromosome mechanics; Genotypic control; The mechanisms of crossing-over; The biology of recombination; The pursuit of hibridity; The permanent hibrid; The evolution of sex; Sterility: the contradiction; Apomixis: the escape; The integration of the cell; The evolution of heredity. |
Índice
PREMISES OF GENETICS | 1 |
Resting Nucleus a Ball of ThreadsSpiralisation of Chromosomes | 8 |
THE PROCESS OF ASSORT | 17 |
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AABB adaptation allopolyploid anaphase apomixis arise attraction basic number behaviour bivalents breakage centro centromeres chiasma chiasma frequency chiasmata chromatids chromo chromomeres chromosome number co-orientation combination crossing-over cytoplasm Darlington depends determined differential segment diploid diplotene divide division Drosophila effect egg cells ends equilibrium evolution female fertile fertilisation flowering plants formed gametes gene difference genetic system genotype genotypic control give haploid haploid set heredity homologous Hookeri individual inert inheritance interchange hybrid inversion kinds male mechanism meiosis metaphase mitosis mitotic mutation natural selection normal nucleus number of chromosomes occur Oenothera organisms orientation pairing segment pairs of chromosomes parent parthenogenesis particles physiological plants and animals plastids pollen grains polyploid produced progeny properties prophase pure quadrivalents recombination reduced relational coiling repulsion resting stage segregation self-fertilisation sexual reproduction species spindle sterility structural changes suppressed takes place telophase terminalisation tetraploid threads torsion triploid univalents unpaired usually variation Y chromosome zygote