APPENDIX I 



Chromosome [cotitiimed) 



Chromosome Map, a diagram portraying the Linear Order or arrange- 

 ment of the genes within tlic chromosome. The distances between the 

 points representing genes arc made proportional to the frequency 

 of recombination (usually), lethal mutation, or breakage observed 

 between the genes, or to their physical distances apart as measured 

 in mitotic or polytcne chromosomes. 

 Chromosome Set, a minimum or basic complement of chromosomes 

 derived from the supposed gametic complement of an ancestor, v. 

 Polyploid. 

 Supernumerary or B Chromosomes, such as are unessential to develop- 

 ment. 

 Chromosome Theory, that the chromosomes are the material basis of 



inheritance. 

 Chromosome Thread, the protein framework of the cliromosome, 

 bearing the genes. 



Cline, a gradient within a continuous population in the frequencies in 

 different localities of different genotypes (Genocline) or pheno- 

 types (Phenocline). J. S. Huxley 1939. 



Clone, a group of organisms descended by mitosis from a common 

 ancestor, i.e. multiplied by Asexual Reproduction. Webber 1903. 



Coenospecies, v. Species. 



Coil, one complete revolution of an hiternal Spiral. 



Coincidence, Coefhcient of, the proportion wliich the numbers of 

 double cross-overs observed bears to the number expected from the 

 random combination of single cross-overs between three or four 

 linked genes, v. hiterference. Midler 19 16. 



Collateral-s, individuals, in a family, not related by direct descent. 

 Collateral Inheritance, the appearance of characters in some but not 

 all the collateral members of a family. 



Complementary Genes, genes which together produce an effect quali- 

 tatively distinct from the effects of any of them separately. As 

 Complementary Elements, Batcson, Saunders and Punnett 1906. 



Complex, v. Heterozygote. 



Complex Character, one Vv^hose difference from an alternative is not 

 transmitted as a single unit in heredity. Cf. Character. 



Condensation or Contraction (of the chromosome), the spiralization 

 and charging of a chromosome with nucleic acid. 



CoNHGURATiON, an association of two or more chromosomes at meiosis 

 segregating independently of other associations at anaphase. 

 Darlington 1929. 



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