Release of Genetic Variability Through Recombination. Ii. Drosophila Persimilis

Abstract

ECOMBINATION between loci on chromosomes taken from a well adapted R population releases an extensive array of variability ( DOBZHANSKY 1946;WALLACE et al. 1953). To compare the amount of variability provided by recombination of linked genes affecting viability in two sibling species of Drosophila the experiments described here on Drosophila persimilis recombination follow the experiments in the preceding paper by SPASSKY et al. (1958) in basic plan.

The Estimation of Relative Fitness of Drosophila Populations. II. Experimental Evaluation of Factors Affecting Fitness

“…No significant effect of initial percentage of D. melanogaster on relative fitness was found. Evidently quite small samples of a population may contain a significant proportion of the gene pool determining the fitness of that population (see also Spassky, Spassky, Levene, and Dobzhansky, 1958;Dobzhansky, Levene, Spassky, and Spassky, 1959;Spiess, 1959;and Milkman, 1960a, b).…”

“…A new population has been formed from two previously separated ones, and this population will have its own fitness value. Thus we can estimate the relative fitnesses of two populations and find, for example, that the relative fitness of population A is higher than that of population B, but this does not allow the prediction of the relative fitness of the new population formed from (A+ B) (see also Vetukhiv, 1953Vetukhiv, , 1954Wallace, King, Madden, Kaufmann, and McGunnigle, 1953;Brncic, 1954;Cordeiro and Dobzhansky, 1954;Spassky et al, 1958;Dobzhansky et al, 1959;and Spiess, 1959).…”

Chromosomal Polymorphism in Drosophila Paramelanica Patterson

“…In these cases the cost of maintenance of such associations is the elimination of individuals carrying nonadaptive chromosomes produced by recombination. Associations of this sort have been demonstrated in D. melanogaster (MISRO 1949;WALLACE et al 1953), in D. pseudoobscura (DOBZHANSKY 1946SPASSKY et al 1958), in D. prosaltans (DOBZHANSKY et al 1959) and in D. persimilis (SPIESS 1959).…”