File:Botany of the living plant (1947) (20219439040).jpg

Title: Botany of the living plant
Identifier: botanyoflivingpl00bowe (find matches)
Year: 1947 (1940s)
Authors: Bower, F. O. (Frederick Orpen), 1855-1948; Wardlaw, C. W. (Claude Wilson), 1901-
Subjects: Botany; Plants
Publisher: London, Macmillan and Co. , ltd.
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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Fig. 433. Camera lucida drawings of chromosomes in the prophase of meiosis. A, Ltltum pardalinum ; B, Fritillana lanceolata. Note the correspondence between the sue and sequence of the particles of the pairing chromosomes. In 13 the four strands (chromatids) are clearly seen. There is one chiasma in each case. (From Crane and Lawrence after Belling.) essentially a process of nuclear fusion. The first division of the zvl is an ordinary mitosis (apart from cases like that of Spirogyra, where the zygote itself undergoes meiosis on germination), with equal distribution of chromosome-halves (chromatids) ; and all subsequent vegetative divisions follow the same course. As botli the nude and the female gametes are haploid, syngamy restores the full number of chromosomes. The diploid sporophyte i- thus initiated, and the normal nuclear cycle, diploid sporophyte- haploid gametophyte diploid sporophyte, may be repeated indefinitely. Chromosome Complkmini (Karyotype). It has already been noted that the chromosome number i< constant for all the somatic divisions of any normal plant. Thus the Garden

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