Knight — 100 — Dictionary 



Monoploid. — (i) Haploid. (ii) The basic haploid chromo- 

 some number in a polyploid series. 



Monoploid Hybrid. — A hybrid carrying a single genom 

 made up of chromosomes and portions of chromosomes from 

 different sources. (Occurs in certain algae and bryophytes). 



Monosome. — The unpaired sex chromosome. 



Monosomic. — A diploid in which one chromosome is missing 

 from the complement. 



Monospermy. — Fertilization by only one spermatozoon. 



Monostigmatous. — Possessing only one stigma. 



Monostylous. — With only one style. 



Monothelious. — Of a female animal: having more than one 

 mate. 



Monotocous. — Giving birth to a single offspring after each 

 gestation, cf. Multiparous. 



Monotypic. — Having only one form. 



Mon-oval Twins. — Uniovular, monozygotic, or identical 

 twins, i.e. those arising from a single egg. 



Monozygotic. — Of twins, triplets, etc. : originating from one 

 fertilized egg, which gives rise to two or more individuals. 



Morbific Factor. — A genetic factor which governs the pre- 

 disposition of an individual to any particular disease or which 

 directly controls a particular morbid condition (e.g. haemo- 

 phiHa). 



Morgan. — A unit measure of the comparative linear distance 

 between genes, each morgan is equal to one percent of crossing- 

 over. 



Morphogenesis. — The developmental history of an organism 

 or of a part of an organism. The evolution of structures. 



Morphoplasm. — Formative protoplasm. A modified type of 

 cytoplasm which appears in the form of strands (e.g. spindle 

 fibres) or of channels in the unmodified cytoplasm. 



Mosaic. — A chimaera, particularly when produced by re- 

 peated mutation. 



Mother-cell. — A diploid cell whose nucleus divides meioti- 

 cally to give four haploid nuclei. The sperm mother-cell is 

 called the spermatocyte and the egg mother-cell the oocyte, 

 in animals. 



Mule. — The offspring of a male donkey and a mare. 



Mullerian Mimicry. — Resemblance as between two unpalat- 

 able species. In this form of mimicry the two species, by sharing 

 a similar type of aposematic coloration, share jointly the risk 

 of mistaken attack by a predator, cf. Batesian — . 



Multigenic. — Controlled by a number of genes ; multifactorial. 



