Crisscross Inheritance — 35 — Cytocentrum 



mediate next generation because it is masked by dominance 

 or by general similarity of the two parental types. 



Cryptogonomery. — This consists in the parent nuclei in 

 hybrids retaining their individuality until the reduction division 

 and separating at reduction. 



Cryptomere. — (i) A gene M^hich by itself has no visible effect 

 but whose existence can be demonstrated by means of suitable 

 crosses, i.e. a complementary factor, (ii) A recessive factor. 



Cryptomerism. — The masking of characters due to recessive- 

 ness or to a complementary factor basis of inheritance (see 

 cryptomere). 



Cryptomitosis. — A type of division, found in Protozoa, in 

 which a spindle is formed but no chromosomes appear, the 

 chromatin agglomerating in the equatorial region in a single 

 mass. 



Cryptoplasm. — The non-granular portion of the cytoplasm. 



Cryptorchid. — Having the testes within the abdominal cavity; 

 an individual whose testes have not descended into the scrotum. 



Cryptorchidism. — The condition which results from the fail- 

 ure of one or both testicles to descend into the scrotum. 



C-tumour. — The characteristic swelling produced by plant 

 tissues which have been treated with colchicine or some simi- 

 lar polyploiding substance. 



Cull. — To remove, or discard, undesirable individuals from a 

 family, breed, variety or other breeding unit; the equivalent, 

 in animal breeding, of roguing in plant breeding. 



Cumulative Factors. — Non-allelomorphic factors affecting 

 the same character and enhancing each other's effect; additive 

 factors. 



Cumulus Oophorus. — A small 'mound' of epithelial cells on 

 which the ovum rests within the Graafian follicle. 



Cuttings — A portion of a plant which is cut off and encouraged 

 to form roots so as to produce a new plant. 



Cyclosis. — The "streaming" of protoplasm within a cell. 



Cyesis. — Pregnancy; gestation; the period between fertiliza- 

 tion and the birth of the offspring. 



Cytaster. — An aster which is located in the cytoplasm outside 

 the immediate nuclear zone. 



Cytes. — Spermatocyte and oocyte stages in gametogenesis. 



Cytoblast. — A nucleus; the most constant constituent of 

 animal and plant cells which reproduces by mitosis and con- 

 tains the chromosomes. 



Cytocentrum. — Central body, q.v. 



