zygo-comb. form

1877 T. H. Huxley Man. Anat. Invertebrated Animals vi. 319 A large, elongated postero-lateral or zygocardiac ossicle.

1888 Amer. Naturalist 22 832 The zygodont (quadritubercular) type.

1950 Adv. Genetics 3 194 The most common mode of animal reproduction is, however, sexual reproduction or gamogony or zygogenesis.

1973 B. J. Williams Evol. & Human Origins iii. 37/2 It [sc. random genetic drift] includes all events that lead to sampling error in random zygogenesis.

1950 Adv. Genetics 3 198 In other parthenogenetic animals both parthenogenetic and zygogenetic reproduction are present.

1978 Biol. Bull. 155 273 (heading) Artemia hemoglobins: genetic variation in parthenogenetic and zygogenetic populations.

1966 J. Sybenga in Genetica XXXVII. 188 General occurrence of localization of the function of initiation of chromosome pairing (long-distance attraction) in discrete units on specific loci is considered a useful working hypothesis. In analogy to ‘centromere’, ‘chromomere’ and ‘telomere’ the term ‘zygomere’ is proposed for such units.

1981 Cytologia XLVI. 527 Since the bivalent formation has not been disturbed, at least one of two zygomeres seems to be able to have a complete activity.

1911 Q. Jrnl. Microsc. Sci. 57 32 The debatable stages of the meiotic prophases in which parasyndesis and its associated phenomena occur—leptonema, zygonema..—have been dealt with by many experienced cytologists.

1911 Q. Jrnl. Microsc. Sci. 57 33 By the time the zygonema is fairly far advanced we do get appearances not unlike what may occasionally..be found in the condensation of a somatic chromosome.

1976 Nature 8 Apr. 534/2 It is generally known that during zygonema (stages XII–XIV in rat spermatogenesis) the homologous sets of sister chromatid pairs begin to come together and associate with one another.

1901 Proc. Zool. Soc. 466 A Vivipara possessing a single zygoneurous connection on the left and the normal dialoneurous relationship of the nerves upon the right.

1892 Proc. Zool. Soc. 182 For the Zygophiurans assistance in classification will be gained from Ljungman's well-known work.

1904 A. F. Blakeslee in Science 3 June 866/1 In all species of both homo- and heterothallic groups..the swollen portions (progametes) from which the gametes are cut off do not grow toward each other..but arise as a result of the stimulus of contact between more or less differentiated hyphæ (zygophores).

1970 J. Webster Introd. Fungi ii. ii. 116 When two compatible strains approach each other aerial club-shaped branches or zygophores develop which show directional growth towards zygophores of the opposite strain. Zygophores of the same strain repel each other.

1904 Science 3 June 866/1 In the heterogamic subdivision of the homothallic group, a distinct and constant differentiation exists between the zygophoric hyphæ and the gametes derived from them.

1978 Canad. Jrnl. Bot. 56 1061 One or more slender, lateral zygophoric filaments proliferate from the subterminal portion of a septate, erect hypha.

1885 G. L. Goodale in A. Gray & G. L. Goodale Bot. Text-bk. (ed. 6) II. ii. xiv. 439 The sexual process in Zygophytes is characterized by the confluence of the protoplasmic masses of two very similar cells by which a new mass is formed as the starting-point of the new individual.

1900 W. J. Lucas Brit. Dragonflies 53 A Zygopterid [wing].

1900 W. J. Lucas Brit. Dragonflies 34 Nymph of a Zygopterid Dragonfly.

1905 Ann. Bot. 19 249 A similar operation of the law of chance has been suggested by Strasburger ('04) in the separation of the chromatin granules as a result of the division of the ‘zygosome’.

1910 Ann. Bot. 24 727 Grégoire.., while agreeing with the parasynaptic chromosome formation, put a different interpretation on to the ‘gamosomes’ and ‘zygosomes’ of Strasburger and Miyake.

1974 Jrnl. Heredity 65 257/1 The varying amounts of the q segments present in the zygosome may account in large measure for the physical and mental deviation of these mongoloid patients from the usual spectrum of characteristics typical of mongoloids bearing three independent chromosomes 21.

1880 A. W. Bennett & Murray in Q. Jrnl. Microsc. Sci. XX. 417 The conjugated zygospheres..constitute a zygosperm.

1892 Proc. Zool. Soc. 1 Mar. 178 To regard the streptospondyline type [of ophiuroids] as earlier than the zygospondyline.

1881 St. G. Mivart Cat 463 The caudal vertebræ are few and end in a bone, shaped somewhat lika a plough~share, called the zygostyle.

1881 Nature 28 July 292 Family Protococcaceæ. Genus Chlorochytrium... Each cell becomes resolved into spherical zoospores, which upon leaving the mother-cell conjugate within the gelatinous envelope. The zygozoospores before becoming surrounded with a membrane make their way..into the intercellular spaces of living plants.