By John G. Scandalios, Theodore R.F. Wright, John G. Scandalios (Eds.)
This quantity in a chain on genetics, emphasizes the variety of genetic reports. Articles disguise the filamentous fungus neurospora, biogenesis of yeast ribosomes, evolutionary genetics of fish, drosophila transposable parts and the dropophila gene zeste.
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Additional info for Advances in Genetics, Vol. 26
Both of these will prolong the travel through the style, thus reducing the effect of time between visits. The sixth variable will also influence competition between pollen tubes of separate visits. The GENETICS OF ANGIOSPERM POLLEN 35 greater the variance, the greater will be the probability that rapidly growing pollen tubes from late arrivals will be able to overtake the slowest tubes of early deposits. The importance of the last variable is obvious. In G . 2 mmlhour. Since flowers of that species each contain 10 ovules (only half of which yield seeds), 20 pollen tubes will probably suffice to effect complete seed set.
Pfahler (1967) found that the outcome of pollen tube competition was significantly influenced by stylar genotype, and, in raspberry, even though pollen genotype did not have a statistically significant effect on the number of pollen tubes per style, there were small but significant interactions between stylar and pollen genotypes (Jennings and Topham, 1971). Cases such as self-incompatibility and Ga (gametophytic) factors, discussed below, also represent specific style and pollen interactions, but these are special phenomena, distinct from more general interactions.
Although several models which take into account the effect of gametic selection have been elaborated, a comprehensive study which considers zygotic and prezygotic (gametic or gametophytic) selection, Malthusian parameters in both male and female generations, and the relative number of genotype combinations has not been produced. The topic was treated by Haldane (19241, showing that selection in the haplophase is much more efficient than in the diplophase. More recently, simple models involving two alleles have been used (Prout, 1953; Buck, 1957; Lewontin, 1958, 1968).
Advances in Genetics, Vol. 26 by John G. Scandalios, Theodore R.F. Wright, John G. Scandalios (Eds.)