Heterogeneous heterozygosities in Mus musculus populations.

摘要: Both chance and adaptation have effects in determining the genetical constitution of local populations any organism, but opinions differ widely over their relative importance. This study describes frequencies electrophoretically detected alleles at 22 loci 1538 house mice (Mus musculus L.) from 27 population samples collected Faroe, Shetland Orkney archipelagoes; mainland Great Britain plus three small off-shore islands; a sub-Antarctic island (Macquarie) lying between Australia Antarctic Continent. Neither average heterozygosities nor distribution allele different showed discernible pattern, least (Hbb, Es-2, Dip-1) underwent seasonal changes frequency which could only be due to selection. Moreover overall variances were significantly heterogeneous (P $\approx $ 0.001), suggesting that factors affect loci. The key understanding this apparent randomness is recognizing selection pressures are non-constant, particular traits may fitness spasmodically. occurrence an reflect historical factors, trait(s) affected by it potentially subject time. For example, proportion heterozygotes Hbb locus one (Skokholm) living entirely independent man, increased five summers out six. Winter death cold-dependent, exceptional summer followed particularly mild winter when usual decrease did not take place. An r-selected species like mouse more likely reveal interplay purpose than numerically less volatile short-term adjustment will relatively uncommon.