Abstract
THE effects of restricted dispersion on the genetic properties of a continuous
population have been treated mathematically in a previous paper (WRIGHT
1943a). The conclusions have been applied to the interpretation of observed
local variability in a population of a plant, Linanthus Parryi (WRIGHT 1943b)
and in one of an animal, Drosophila pseudoobscura (DOBZHANSKY and WRIGHT
1943). The mathematical treatment was based on the assumption of com-
pletely random union of gametes within each neighborhood and thus would
rarely be strictly applicable to actual cases. The purposes of the present paper
are to compare the effects of various systems of mating within continuous pop-
ulations, and to present a more accurate method than before for estimating
from data an important theoretical quantity, N, the effective size of popula-
tion of a “neighborhood” in the sense discussed below.
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