Effects of body size, accessory gland and testis size on pre- and postcopulatory success in Drosophila melanogaster

2002 ◽  
Vol 64 (6) ◽  
pp. 915-921 ◽  
Author(s):  
J Bangham ◽  
T Chapman ◽  
L Partridge
Keyword(s):  
Drosophila Melanogaster ◽  
Body Size ◽  
Accessory Gland ◽  
Testis Size

scholarly journals Virility does not Imply Immensity: Testis size, Accessory Gland Size and Ejaculate depletion pattern do not Evolve in Response to Experimental Manipulation of Sex Ratio in Drosophila melanogaster

2015 ◽  
Author(s):  
◽  
Zeeshan Ali Syed ◽  
N G Prasad
Keyword(s):  
Drosophila Melanogaster ◽  
Sex Ratio ◽  
Sperm Competition ◽  
Competitive Ability ◽  
Experimental Manipulation ◽  
Reproductive Organ ◽  
Accessory Gland ◽  
Testis Size ◽  
Gland Size ◽  
Competition Theory

Sperm competition theory predicts that increase in sperm competition should result in bigger male reproductive organ(s) or higher ejaculate investment. We test this idea using experimental evolution in Drosophila melanogaster. We maintained replicate populations of Drosophila under male (M) and female (F) biased sex ratio regimes for more than a hundred generations. Males in M regime have evolved higher sperm competitive ability than those in F. We measured the testes and the accessory gland size of virgin and singly mated males from the M and F populations. The M and F males do not differ in either testis or accessory gland size. Additionally, ejaculate investment is not different in the M and F males, as measured by reduction in testis and accessory gland sizes. Thus, contrary to theoretical prediction and evidence from other species, evolved differences in sperm competitive ability is not due to evolution of testis/accessory gland size or strategic ejaculate investment in these populations.

II.—Hidden Divergence in Laboratory Strains of Drosophila pseudo-obscura

1944 ◽  
Vol 62 (1) ◽  
pp. 9-19 ◽  
Author(s):  
Rowena Lamy
Keyword(s):  
Body Size ◽  
Sex Ratio ◽  
Genetic Constitution ◽  
Low Grade ◽  
Testis Size ◽  
Hybrid Female ◽  
Back Cross ◽  
Pure Race ◽  
Range Of Variation

The Race A/Race B hybrid females of D. pseudo-obscura have a high percentage of fertility, comparable with that of females of pure race. The number and viability of their offspring, however, are largely affected by the genetic constitution of the hybrid female as well as by that of the male to which she is mated in the backcross. Hence the performance of any given hybrid is determined in the first instance by the actual strains of the pure races which are used in making the P1 racial cross. Generally speaking the results are of the same order whenever the same strains are used. The progenies of hybrid females of different genetic constitution may differ in three main aspects: (1) The total number of offspring may be comparable with that usually obtained in a pure race cross; it may be reduced to any extent; in certain matings it is consistently at zero. (2) The sex ratio may be completely normal or male-deficient or female-deficient in any degree; completely uni-sexual progenies are sometimes obtained. (The above observations are mainly in agreement with reports of earlier writers; cf. Lancefield, 1929, Dobzhansky, 1936, Mampell, 1941, Sturtevant, 1937.) (3) “Viability characters,” i.e. those affecting general vigour and physical normality, may be of a high or a low grade; some progenies are comparable in this respect with the pure race, the only exception being that they show a much greater range of variation in body-size of both sexes, and in the testis size of males, abnormalities which are common to all back-cross progenies whatever the genetic constitution of the mother or father. Some progenies show in addition deformities of a peculiar type usually affecting the abdomen and occasionally the legs and wings.

Testing for Asymmetrical Gene Flow in aDrosophila melanogasterBody-Size Cline

Genetics ◽  
2003 ◽  
Vol 165 (2) ◽  
pp. 667-673 ◽  
Author(s):  
W Jason Kennington ◽  
Julia Gockel ◽  
Linda Partridge
Keyword(s):  
Drosophila Melanogaster ◽  
Gene Flow ◽  
Body Size ◽  
Genetic Parameter ◽  
Good Evidence ◽  
Microsatellite Data ◽  
Eastern Australia ◽  
The Difference ◽  
Two Populations ◽  
Private Alleles

AbstractAsymmetrical gene flow is an important, but rarely examined genetic parameter. Here, we develop a new method for detecting departures from symmetrical migration between two populations using microsatellite data that are based on the difference in the proportion of private alleles. Application of this approach to data collected from wild-caught Drosophila melanogaster along a latitudinal body-size cline in eastern Australia revealed that asymmetrical gene flow could be detected, but was uncommon, nonlocalized, and occurred in both directions. We also show that, in contrast to the findings of a previous study, there is good evidence to suggest that the cline experiences significant levels of gene flow between populations.

scholarly journals Quantitative genetic analysis of natural variation in body size in Drosophila melanogaster

Heredity ◽  
2002 ◽  
Vol 89 (2) ◽  
pp. 145-153 ◽  
Author(s):  
J Gockel ◽  
S J W Robinson ◽  
W J Kennington ◽  
D B Goldstein ◽  
L Partridge
Keyword(s):  
Drosophila Melanogaster ◽  
Body Size ◽  
Genetic Analysis ◽  
Natural Variation ◽  
Quantitative Genetic ◽  
Quantitative Genetic Analysis

Cost of mating in Drosophila melanogaster females is mediated by male accessory gland products

Nature ◽  
1995 ◽  
Vol 373 (6511) ◽  
pp. 241-244 ◽  
Author(s):  
Tracey Chapman ◽  
Lindsay F. Liddle ◽  
John M. Kalb ◽  
Mariana F. Wolfner ◽  
Linda Partridge
Keyword(s):  
Drosophila Melanogaster ◽  
Accessory Gland ◽  
Male Accessory Gland
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