| age, experience, and rare-male mating advantages in drosophila pseudoobscura. | | 1974 | 4842092 |
| cold temperature resistance, chromosomal polymorphism and interpopulation heterosis in drosophila pseudoobscura. | descendants of two colorado, u.s.a., populations of d. pseudoobscura, boulder and la foret, were exposed to +2 degrees and -2 degrees . in third instar larvae from boulder ar and pp third chromosome gene arrangements survived better than tl and others, while the reverse situation occurred for la foret. deleterious dominant effects were observed for ar from la foret. in adults from boulder there was a trend towards greater survival for ar and pp than for other gene arrangements, while ar from la ... | 1974 | 4838761 |
| on the very rapid enhancement by d2o of the temperature-tolerance of adult drosophila. | deuterium oxide, d(2)o, increases the temperature-tolerance of drosophila pseudoobscura when it is administered to adult flies as a sucrose solution. the effect is very rapidly exerted; it is detected within 10 min after the flies have a brief (10 min) opportunity to drink. this increased resistance to heat-death surely implies an increased resistance of macromolecules to thermal denaturation. d(2)o is known to exert such an effect on in vitro protein solutions. the speed with which the increase ... | 1974 | 4521820 |
| early and late subjective night phases of the drosophila pseudoobscura circadian rhythm require different energies of blue light for phase shifting. | | 2009 | 4273696 |
| studies on the sal locus in drosophila pseudoobscura. 3. the molecular pattern of dna in active and inactive chromosome regions. | | 1973 | 4762789 |
| a differential effect of heavy water on temperature-dependent and temperature-compensated aspects of circadian system of drosophila pseudoobscura. | d(2)o is the only "chemical" agent that consistently affects the frequency of circadian oscillations: its effect is now known to be so widespread and predictable that its action merits closer study as a potential clue to the currently obscure concrete nature of circadian oscillators. the great diversity of d(2)o effects on biological systems in general is briefly reviewed and the need for rejectable hypotheses concerning the action of d(2)o on circadian clocks is stressed because current specula ... | 1973 | 4516204 |
| temporal frequency changes of enzyme and chromosomal polymorphisms in natural populations of drosophila. | a comparative study of chromosomal and enzyme polymorphisms in drosophila pseudoobscura and in d. persimilis was conducted from april 1971 to october 1972 by taking samples at monthly intervals in two different localities. seasonal cyclic changes occur in the chromosomal polymorphisms. significant changes occur in the frequencies of the enzyme polymorphisms; preliminary evidence indicates that some of these changes may also be cyclic. natural selection is the main process responsible for the cha ... | 1973 | 4514981 |
| chromosomal control of mating activity in drosophila pseudoobscura. | lines containing two third-chromosome inversions (arrowhead and pikes peak) of drosophila pseudoobscura selected for fast and slow mating speed were crossed to a multichromosomal, dominant marker inversion stock, and strains with various combinations of chromosomal derivation were tested for their mating activity. when lines were selected isodirectionally with the known third-chromosome control, the third chromosome was found to possess major epistatic control over mating speed, followed by the ... | 1973 | 4510290 |
| viabilities of third chromosomes of drosophila pseudoobscura differing in relative competitive fitness. | arrowhead (ar) third chromosome arrangements of drosophila pseudoobscura, whose competitive fitnesses had been determined in population cages, were tested for their genetic loads in homozygous, heterozygous (homokaryotypic), and heterokaryotypic (ar/ch) combinations. the results showed that their competitive population cage performances were correlated to their viabilities as homozygotes but were not correlated to their viabilities as heterozygotes or as heterokaryotypes. however, the results do ... | 1972 | 4652876 |
| studies on the sal locus in drosophila pseudoobscura. ii. modes of regulation of the sal banding pattern. | from a consideration of genetic and chromosomal alterations which affect the banding pattern of a specific salivary chromosome region, it is concluded that (1) a regulator locus, sal, is closely linked with the region in question but separated from it spatially by a few bands; (2) either mutation of the sal locus or transfer of the region to a heterochromatic region affects the banding pattern similarly; and (3) the change probably consists of a compaction of dna and a concomitant inactivation o ... | 1972 | 4643822 |
| studies on the sal locus in drosophila pseudoobscura. i. the banding pattern of the tip of salivary chromosome 3 in larvae homozygous and heterozygous for sal. | in the mutant sal the banding pattern at the tip of chromosome 3 is changed. certain bands are compacted instead of being partially puffed. in sal(+)/sal heterozygotes, when the chromosome tips are paired they both show the sal(+) pattern or are intermediate; but when unpaired, each shows the pattern characteristic of its own genotype. | 1972 | 4647718 |
| direct evidence of genic differentiation between sex ratio and standard gene arrangements of x chromosome in drosophila pseudoobscura. | evidence of strong association of alleles at the esterase-5 and adult acid phosphatase-6 loci with the sex ratio and the standard x chromosome arrangements in d. pseudoobscura is presented. there is no differentiation at these two loci, either in the sex ratio or the standard arrangement from two widely separated geographic populations. at the esterase-5 locus, alleles characteristic of one arrangement are found in low frequencies in the other arrangement. it is concluded, from these and other o ... | 1972 | 5073855 |
| developmental studies in drosophila. vi. ultrastructural analysis of the salivary glands of drosophila pseudoobscura during the late larval period. | | 1972 | 4340674 |
| genetic analysis of geotactic and phototactic behavior in selected strains of drosophila pseudoobscura. | | 1972 | 4664205 |
| developmental studies in drosophila. ii. ultrastructural analysis of the salivary glands of drosophila pseudoobscura during some stages of development. | | 1972 | 4335117 |
| how genetic background masks single-gene heterosis in drosophila (polymorphism-selection-isoenzymes-inbreeding-fly). | conditional heterosis associated with two isoallelic forms of octanol dehydrogenase in drosophila pseudoobscura has been detected in flies that have been (a) inbred for several generations to make the background genotype as homozygous as practicable, and (b) grown on a medium containing a small amount of octanol. the heterosis was first found in inbred males. the possibility that the effect in females was masked by x-linked polymorphic genes affecting the same fitness components as the locus for ... | 1972 | 4501117 |
| crystalline inclusions in the salivary gland cells of drosophila pseudoobscura. | | 1971 | 5092852 |
| measurement of fitness at the esterase-5 locus in drosophila pseudoobscura. | | 1971 | 5097534 |
| association of karyotype with body weight and resistance to desiccation in drosophila pseudoobscura. | | 1971 | 5563332 |
| a population cage test for heterosis in drosophila pseudoobscura. | | 1970 | 5512472 |
| "sex ratio" in drosophila pseudoobscura: spermiogenic failure. | contrary to earlier reports, testes of "sex ratio" drosophila pseudoobscura males have only half as many sperm per bundle as testes of normal males do. this fact, determined from electron micrographs, indicates that the functional pole hypothesis is not applicable to the action of "sex ratio." | 1970 | 5432586 |
| concurrent inbreeding and selection in drosophila pseudoobscura. | | 1970 | 5479389 |
| selection in experimental populations of drosophila pseudoobscura with different initial frequencies of chromosomal variants. | | 1970 | 5415223 |
| adaptation by natural selection in populations of drosophila pseudoobscura. | | 1970 | 5413803 |
| the relationship between the intensity of light phases and the extent of phase shifts of the circadian rhythm in the eclosion rate of drosophila pseudoobscura. | | 1969 | 5372004 |
| morphological differences between drosophila pseudoobscura populations selected for opposite geotaxes and phototaxes. | | 1969 | 17248462 |
| the genetic basis of sound production in drosophila pseudoobscura and d. persimilis. | | 1969 | 5370966 |
| factors determining rates of the evolution of fitness in laboratory populations of drosophila pseudoobscura. | | 1969 | 17248453 |
| on the absence of circadian rhythmicity in drosophila pseudoobscura pupae. | | 1969 | 5798455 |
| the genetics of drosophila mating behavior. ii. the genetic architecture of mating speed in drosophila pseudoobscura. | | 1969 | 5371028 |
| chromosomal polymorphism and genetic load in drosophila pseudoobscura. | | 1969 | 5364967 |
| a molecular approach to the study of genic heterozygosity in natural populations. iv. patterns of genic variation in central, marginal and isolated populations of drosophila pseudoobscura. | | 1969 | 5364966 |
| action spectra for phase shifts of a circadian rhythm in drosophila. | action spectra were determined for lightinduced phase shifts of the circadian rhythm of adult emergence in drosophila pseudoobscura. the action spectra for advance and delay phase shifts are similar; the most effective wavelengths are in the blue region, with a sharp cutoff above 500 nanometers. this similarity suggests that the same photoreceptive pigment mediates both advance and delay phase shifts. | 1969 | 5762935 |
| artificial and natural selection for two behavioral traits in drosophila pseudoobscura. | in an attempt to elucidate the genetic architecture of two behavioral traits, populations of drosophila pseudoobscura were selected for positive and for negative phototaxis and geotaxis. the selected populations diverged rapidly in their behavior (figs. 1 and 2). the selection was relaxed after 20 generations in the phototactic, and after 30 generations in the geotactic populations. the relaxation resulted in convergence almost as rapid as was the divergence under selection. the average phototac ... | 1969 | 5253666 |
| further evidence for coadaptation in crosses between geographic populations of drosophila pseudoobscura. | | 1968 | 5713603 |
| the genetics of drosophila mating behaviour. i. organization of mating speed in drosophila pseudoobscura. | | 1968 | 5709775 |
| courtship and mating time in drosophila pseudoobscura. | | 1968 | 5709773 |
| genetics of natural populations. xl. heterotic and deleterious effects of recessive lethals in populations of drosophila pseudoobscura. | | 1968 | 5705830 |
| temperature compensation of the circadian oscillation in drosophila pseudoobscura and its entrainment by temperature cycles. | | 1968 | 5655535 |
| selection for higher fitness in populations of drosophila pseudoobscura. | four laboratory populations, each consisting of flies homozygous for a wild second chromosome, were maintained in population cages. three of them were initially characterized by low fecundity of the females; the fourth was a control. after 15 months, in all three populations with low fecundity this character was much improved; two of them, have reached the control level. the changes observed were presumably due to mutation and selection under highly competitive conditions. | 1968 | 5642574 |
| frequency dependence of mating success in drosophila pseudoobscura. | | 1968 | 5647626 |
| parental age effects in drosophila pseudoobscura. | | 1968 | 5697303 |
| genetics of natural populations. xxxix. a test of the possible influence of two insecticides on the chromosomal polymorphism in drosophila pseudoobscura. | | 1968 | 5668291 |
| selection for and against gregariousness in the choice of oviposition sites by drosophila pseudoobscura. | | 1968 | 5664388 |
| genetic divergence in m. vetukhiv's experimental populations of drosophila pseudoobscura. iv. relative viability. | | 1967 | 5587945 |
| genetic loads affecting fertility in natural populations of drosophila pseudoobscura. | | 1967 | 5586879 |
| genetic loads affecting longevity in natural populations of drosophila pseudoobscura. | | 1967 | 6057227 |
| circadian systems. i. the driving oscillation and its assay in drosophila pseudoobscura. | | 1967 | 5237901 |
| gene arrangements in the third chromosome of drosophila pseudoobscura. ii. all possible configurations. | | 2003 | 6055325 |
| genetic loads affecting fecundity in natural populations of drosophila pseudoobscura. | | 1967 | 6040492 |
| an experiment on migration and simultaneous selection for several traits in drosophila pseudoobscura. | | 1967 | 6036950 |
| variability within and between strains for mating behavior parameters in drosophila pseudoobscura. | | 1967 | 6032107 |
| a new gene arrangement in the third chromosome of drosophila pseudoobscura. | | 2003 | 6031680 |
| mating control by gene arrangements in drosophila pseudoobscura. | | 1966 | 17248341 |
| gene arrangements in the third chromosome of drosophila pseudoobscura. i. configurations with tester chromosomes. | | 2003 | 5971037 |
| purification of esterase-5 from drosophila pseudoobscura. | | 1966 | 5969303 |
| comparison of selection responses on body weight under divergent larval density conditions in drosophila pseudoobscura. | | 1966 | 5968645 |
| a molecular approach to the study of genic heterozygosity in natural populations. ii. amount of variation and degree of heterozygosity in natural populations of drosophila pseudoobscura. | | 1966 | 5968643 |
| a molecular approach to the study of genic heterozygosity in natural populations. i. the number of alleles at different loci in drosophila pseudoobscura. | | 1966 | 5968642 |
| sexual isolation caused by selection for positive and negative phototaxis and geotaxis in drosophila pseudoobscura. | | 1966 | 5229969 |
| genetics of natural populations. xxxvii. the coadapted system of chromosomal variants in a population of drosophila pseudoobscura. | | 1966 | 5929240 |
| equilibria for inversions induced by x-rays in isogenic strains of drosophila pseudoobscura. | | 1966 | 5929239 |
| stability of chromosomal polymorphism in populations of drosophila pseudoobscura. | | 1966 | 5226966 |
| mating speed and duration of copulation in drosophila pseudoobscura. | | 1966 | 5226959 |
| the mutational load in two natural populations of drosophila pseudoobscura. | | 1966 | 5913286 |
| genetics of natural populations. xxxvi. epistatic interactions of the components of the genetic load in drosophila pseudoobscura. | | 1965 | 5863911 |
| the genotypic control of mating speed and duration of copulation in drosophila pseudoobscura. | | 1965 | 5218343 |
| experimental control over the evolution of fitness in laboratory populations of drosophila pseudoobscura. | | 1965 | 14326055 |
| cytological basis of "sex ratio" in drosophila pseudoobscura. | cytological investigations of both laboratory and wild "sex ratio" lines of drosophila pseudoobscura reveal that, contrary to earlier reports, no extra replication of the x chromosome occurs in primary spermatocytes. normal disjunction of the sex chromosomes at anaphase i leads to equal numbers of x-bearing and y-bearing secondary spermatocytes. in the latter, the y chromosome regularly shows a "degeneration" at second anaphase. the "sex ratio" effect can be explained in terms of regularly nonfu ... | 1965 | 14263775 |
| bichromosomal synthetic semilethals in drosophila pseudoobscura. | | 1965 | 14338225 |
| genetic divergence in m. vetukhiv's experimental populations of drosophila pseudoobscura. 2. longevity. | | 1965 | 14297592 |
| genetic loads in irradiated experimental populations of drosophila pseudoobscura. | | 1964 | 14239789 |
| lethal and semilethal chromosomes in irradiated experimental populations of drosophila pseudoobscura. | | 1964 | 14239788 |
| inbreeding and viability in experimental populations of drosophila pseudoobscura. | | 1964 | 14231442 |
| the capacity for increase in chromosomally polymorphic and monomorphic populations of drosophila pseudoobscura. | | 1964 | 14221018 |
| mating speed control by gene arrangements in drosophila pseudoobscura homokaryotypes. | | 1964 | 14215621 |
| genetic differentiation within laboratory populations of drosophila pseudoobscura. | | 1964 | 5849558 |
| genetics of natural populations. xxxiv. adaptive norm, genetic load and genetic elite in drosophila pseudoobscura. | | 1963 | 14083044 |
| comparative fitness of experimental populations of drosophila pseudoobscura. | | 1963 | 14080688 |
| genetic studies of natural populations of drosophila: drosophila pseudoobscura, a large dominant population. | | 1963 | 13984396 |
| sex-linked inheritance of a quantitative trait of drosophila pseudoobscura. | | 1963 | 17248170 |
| genetic potential for an extra crossvein in drosophila pseudoobscura. | | 1963 | 17248168 |
| genetics of natural populations. 32. inbreeding and the mutational and balanced genetic loads in natural populations of drosophila pseudoobscura. | | 1963 | 14028273 |
| a comparison of purebred and crossbred selection schemes with two populations of drosophila pseudoobscura. | | 1963 | 17248144 |
| effects of temperature and x-ray irradiation on intrinsic growth rate in populations of drosophila pseudoobscura. | | 1963 | 14058260 |
| genetics of natural populations. xxxi. genetics of an isolated marginal population of drosophila pseudoobscura. | | 1963 | 14028271 |
| selection for geotaxis in monomorphic and polymorphic populations of drosophila pseudoobscura. | | 1962 | 16591004 |
| selection and body size in drosophila pseudoobscura at different temperatures. | | 1962 | 13887953 |
| genetic drift and natural selection in experimental populations of drosophila pseudoobscura. | | 1962 | 13886810 |
| temperature sensitivity of chromosomal polymorphism in drosophila pseudoobscura. | | 1962 | 13996135 |
| effects of temperature on productivity and genetic variance of body size in populations of drosophila pseudoobscura. | | 1961 | 13775221 |
| genetics of natural populations. xxix. is the genetic load in drosophila pseudoobscura a mutational or a balanced load? | | 1960 | 17247959 |
| genetics of natural populations. xxviii. the magnitude of the genetic load in populations of drosophila pseudoobscura. | | 1960 | 17247958 |
| effect of environment upon the manifestation of heterosis and homeostasis in drosophila pseudoobscura. | | 1959 | 17247854 |
| release of genetic variability through recombination. i. drosophila pseudoobscura. | | 1958 | 17247800 |
| selection for developmental rate in drosophila pseudoobscura. | | 1958 | 17247740 |
| the longevity of hybrids between local populations of drosophila pseudoobscura. | | 1957 | 13410487 |
| frequencies of inversion combinations in the third chromosome of wild males of drosophila pseudoobscura. | | 1955 | 16589771 |
| genotypic background and heterosis in drosophila pseudoobscura. | | 1955 | 17247594 |
| genetics of natural populations. xxiv. developmental homeostasis in natural populations of drosophila pseudoobscura. | | 1955 | 17247591 |