By Frederic E Clements
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In this case, v = n. The allelic diversity v decreases with increasing frequency of one allele and consequently decreasing frequencies of the remaining alleles. The effective number of alleles of the gene pool is the harmonic mean of the v at single loci. 1 is v= 1 /p i 2 = i 1 = 1 . 82. 65625 2 Expected Heterozygosity The “expected heterozygosity” He is the most frequently used measure of genetic diversity within populations. , that Hardy–Weinberg structures are realized (Sect. 2). In this case, it is possible to calculate the frequency Pii of a particular homozygote with genotype Ai Ai as pi2 (pi is the frequency of allele Ai).
Gene flow and migration increase the genetic multiplicity of a population, if genes which were previously restricted to certain populations migrate to other populations. Transport of pollen (gene flow in a narrow sense) and seeds (migration) are the main processes involved in the dispersal of genes for most plant species (Chap. 5). By definition, gene flow and migration among populations are rare events. The mating system is decisive for the fusion of male and female gametes. Gene flow through pollen is an obvious prerequisite for mating between two seed plants.
Timber is harvested in plantations and logged in natural populations. Seven natural populations from the southern arc of the Brazilian Amazon basin were investigated at eight microsatellite (simple sequence repeat, SSR) gene loci. 00 0 50 100 150 200 Geographic distance (km) 250 Fig. 2. Comparison of genetic distances (Nei 1972) and geographic distances between ten populations of Eugenia dysenterica. (From Telles et al. 4). The inbreeding coefficient was positive and significantly different from 0 in four populations, indicating a slight excess of homozygotes relative to Hardy–Weinberg proportions (Sect.