Kakogenic — 87 — Kinetochore 



Karyoplasm. — Nucleoplasm; the denser protoplasm of which 

 nuclei are composed as distinct from the less dense cytoplasm 

 outside the nuclear membrane. 



Karyoplast. — A cell nucleus. 



Karyorhexis. — Nuclear fragmentation. 



Karyosome. — A vague term meaning a chromosome, a special 

 form of nucleolus or even a nucleus. 



Karyosphere. — Part of the nucleus into which the chromo- 

 somes have contracted (Darlington). 



Karyota. — Nucleate cells. 



Karyotheca. — The nuclear membrane; the membrane sur- 

 rounding the nucleus, dividing the nucleoplasm from the cyto- 

 plasm. 



Karyotin. — Chromatin; a deeply staining substance in the 

 nucleus; the part of the chromosome that stains deeply with 

 basic dyes during cell division. 



Karyotype. — (i) A group of individuals having the same 

 chromosome number, homologous chromosomes throughout the 

 group being characterized by an approximately similar series 

 of gene loci arranged in the same linear order, (ii) The 

 chromosome complement characteristic of such a group, cf. 

 Genotype. 



Katachromasis. — A general term for the changes which take 

 place during telophase and the formation of daughter nuclei. 



Katagenesis. — Devolution; retrogessive evolution. 



Kataphase. — A collective term for all the stages of mitosis 

 which follow anaphase. 



Key Gene. — A main gene or oligogene; a gene whose effect 

 is sufficiently large to give evident mendelian ratios when 

 examined against an approximately pure genetic background. 



Kindred. — A group of individuals each of whom is related in 

 some way, either by blood relationship or by marriage, to 

 every other member of the group and, in so far as is or can 

 be known at any given time from the available records, to no 

 other person (South wick, 1939). 



Kinetic Body. — A minute granular structure occurring in 

 the immediate vicinity of the centromere. 



Kinetic Constriction. — Centromere; spindle attachment; 

 insertion region; kinetochore; a non-staining, localized region 

 in each chromosome which remains single for some time after 

 the rest of the chromosome has divided, and which, at meta- 

 phase, appears to be attached to the spindle 'fibre'. 



Kinetochore. — Centromere. See Kinetic Constriction, 



