A Synopsis of Biology by W. B. Crow (Auth.) PDF

By W. B. Crow (Auth.)

ISBN-10: 1483200299

ISBN-13: 9781483200293

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ASCOGONIAL FERTILIZATION Occurs in ascomycete fungi. The female organ is termed the a s c o g o n i u m and often has a trichogyne. Unlike the preceding there is no free male cell, b u t the nucleus of the male cell ( a n t h e r i d i u m ) passes to t h a t of the female, continuity of cytoplasm having first been established (through the trichogyne if present). REDUCED SEXUALITY Occurs in many fungi; P s e u d o g a m y (fusion between a gamete and a non-related vegetative cell of the same individual, or even of two vegetative cells).

Whereas the nuclei of the gametes are haploid, t h a t of the zygote is diploid, and from the latter the numerous somatic or diploid cells of the body are usually formed. In lower protozoa fusion of whole organisms occurs ; this is one of the arguments for the unicellular nature of protozoa. I n higher animals the gametes are always of two kinds, s p e r m a t o z o a or s p e r m s in the male and ova or e g g s in the female. The existence of sex, both in animals and plants, was probably known to the ancients.

Neoteny is reproduction in the larval stage ; this is usually b u t not invariably parthenogenetic. In Miastor and related flies it occurs in the larva, and occurs in several of the generations which are produced during, the course of the year. But in the summer there occur individuals t h a t reach the imago stage and reproduce sexually. In the related Tanytarsus paedogenesis occurs in the pupal stage. On the other hand it may be pushed back to the earliest stages in the lifecycle, as in chalcid wasps, and there grades over into polyembryony.

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A Synopsis of Biology by W. B. Crow (Auth.)


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