Mixis — 99 — Monophyletic 



Monochlamydeous. — Possessing a calyx but no corolla. 

 Monochlamydeous Chimaera. — A chimaera in which the 



epidermis forms one component and the inner tissues the 



other, cf. Dichlamidius. 

 Monochorionic. — With only one chorion as in monozygotic 



('identical') twins. 

 Monoclinous. — Having perfect (hermaproditic) flowers. 

 Monodelphous. — Monadelphous, q.v. 

 Monoecious. — Hermaphrodite ; with male and female elements 



on the same plant, but in different flowers. 

 Monoestrus. — • Having only a single oestrus cycle per year 



or per breeding season. 

 Monofactorial. — Controlled by a single factor or gene. 

 Monogametic. — Producing gametes of only one kind in regard 



to their properties of sex determination. 

 Monogamous. — Having only one mate. N. Monogamy. 

 Monogenesis. — (i) Reproduction by asexual means, (ii) 



Theory which supposes evolution to have taken place from 



a single entity. 

 Monogenetic. — Reproducing asexually. 

 Monogenic. — (i) Producing offspring of only one sex. (ii) 



Hemizygous. (iii) Controlled by a single gene; monofactorial. 



N. Monogeny. 

 Monogenist. — One who holds that all humans are derived 



from one common pair of ancestors, cf. Polygenist. 

 Monogenomic Species. — A species whose gametes carry a 



single set of chromosomes i.e. not a polyploid species. 

 Monogony. — Asexual reproduction (animals). 

 Monogynous. — Of a male animal, consorting with only one 



female ; of a flower, having only one pistil. N. Monogyny. 

 Monohybrid. — A cross between parents differing in respect 



of a single gene, or a single specified gene. 

 Monohybrid Heterosis. — Hybrid vigour due to hetero- 

 zygosity at a single gene locus. 

 Monokaryon. — Any nucleus which has only a single centriole. 

 Monomeric. — Carrying a dominant gene at only one of two 



duplicate loci. cf. Dimeric. 

 Monomerical Inheritance. — Inheritance in which a charac- 

 ter is governed by a single allelomorphic pair of genes, as 



opposed to inheritance due to polymeric genes, q.v. 

 Monophyletic. — (i) Descendants of a single interbreeding 



group of populations i.e. of a single species (Mayr). (ii) 



Having a single line of descent from one common parent 



form. cf. Polyphyletic. 



