Knight — 98 — Dictionary 



Mixis. — Fertilization as between specialized gametes with the 

 concomitant phenomena of an alternation of a diploid and a 

 haploid phase. 



Mixochimaera. — An individual obtained by mixing the proto- 

 plasm of two individuals. (Such individuals have been formed 

 artificially in certain fungi). 



Mixochromosome. — A newly fused chromosome pair pro- 

 duced by syndesis (zygotene). 



Mixoploid. — An individual in which polyploid and non- 

 polyploid tissues are intermingled; also used adjectivally as 

 "mixoploid tissue", "mixoploid branch". 



Mixovariation. — A variation due to genetic segregation or 

 to recombination. 



Mock-dominance. — The apparent dominance of a recessive 

 gene due to its being in the hemizygous state so that its 

 dominant allele is absent ; pseudo-dominance. 



Modificational Plasticity. — See Plasticity, Modificational. 



Modifier Complex. — An assemblage of genes which con- 

 jointly affects the degree of expression of a given pair of 

 alleles. (Harland, 1941). 



Modifying Factors or Modifiers. — Factors which modify 

 the effect of a major factor but which have no effect in 

 its absence. 



Molecular System of Heredity. — The cytoplasmic system 

 of heredity in which units of heredity, or determinants, are 

 carried by the cytoplasm, cf. Nuclear System and Corpuscular 

 System. 



Monad. — A single cell arising (instead of a tetrad) from a 

 spore mother-cell as a result of the failure of meiosis. 



Monadelphous. — Having all the stamen filaments joined in 

 a single bundle. 



Monandrous. — (i) Possessing only a single stamen, (ii) 

 Having a single male mate. 



Monandry. — State of being monandrous, q.v. 



Monaster. — A single aster, formed in monocentric mitosis, 

 which does not ordinarily give rise to an amphiaster (Wilson). 



Monobasic. — Having similar genoms, e.g. diploids, autopoly- 

 ploids. 



Monocarpic. — Bearing fruit only once then dying. 



Monocentric. — Having a single centromere. 



Monocentric Mitosis. — Mitosis in which a uni-polar spindle 

 (half-spindle) is formed. 



Monochlamidius Chimaera. — Monochlamydeous chimaera, 

 q.v. 



