title: A re-examination of the case for homology between the X and Y chromosomes of mouse and man.
abstract: Evidence is presented from the literature which suggests that in mouse and man, (1) synapsis between the X and Y is nonhomologous, (2) crossing over does not regularly occur between the X and Y, but is prevented by "precocious" desynapsis, and (3) normal disjunction of the X and Y is assured by an achiasmatic end association.
mesh_terms: D000818:Animals; D001483:Base Sequence; D002869:Chromosome Aberrations; D002874:Chromosome Mapping; D003434:Crossing Over, Genetic; D004247:DNA / Q000235:genetics; D005260:Female; D005796:Genes; D006801:Humans; D007621:Karyotyping; D008297:Male; D008540:Meiosis; D051379:Mice / Q000235:genetics*; D012730:Sex Chromosomes
chemical_list: D004247:DNA