Download Advances in Genetics, Vol. 26 by John G. Scandalios, Theodore R.F. Wright, John G. Scandalios PDF

By John G. Scandalios, Theodore R.F. Wright, John G. Scandalios (Eds.)

This quantity in a chain on genetics, emphasizes the range of genetic reports. Articles conceal the filamentous fungus neurospora, biogenesis of yeast ribosomes, evolutionary genetics of fish, drosophila transposable components and the dropophila gene zeste.

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91) seeds per fruit, 94% of the full day exposure. 05) seeds per fruit or, respectively, 90, 59, and 40% of the standard value. It is important to note that the standard errors of these means are fairly high and it is this which allows the occurrence of pollen competition even when the average seed set is less than 100%. The average seed set is thus a measure of the relative frequency and intensity of pollen tube Competition. Ramstetter found that seed set (and presumably pollen tube competition) was not correlated with average seed weight or percentage germination.

Six variables were included in that study: (1) time between pollinator visits, (2) average number of pollen grains left in one visit, (3) length of the style, (4) pollen tube growth rate, (5) variance in pollen growth rates, and (6) number of ovules available. Time between visits is important in that the first visit may deposit just enough pollen to fertilize all ovules, and, if a second pollinator visit comes much later, all ovules may be fertilized before that occurs. Analysis of the pollen load on the stigma would indicate that pollen competition had occurred, when, in fact, it had not.

1987). For these characters, the large genetic load produced by recombination can be removed by the action of GS at a cost (loss of pollen genot~ypes)compatible with the size of the male gametophytic population. In this sense, GS is a more efficient mechanism than those provided by chromosomal rearrangements, which eliminate the product of the recombination. On the other hand, the special features of the gametophytic population (large size and haploidy) would allow a high evolutionary rate a t a cost compatible with the biological features of the species: the elimination of the genetic load needed for a high rate of evolution (Haldane, 1957, 1960; Maynard-Smith, 1971) can be obtained without great effects on the sporophytic fitness mean.

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