scholarly journals Complementary sex determination, inbreeding depression and inbreeding avoidance in a gregarious sawfly

Heredity ◽  
2016 ◽  
Vol 117 (5) ◽  
pp. 326-335 ◽  
Author(s):  
K E Harper ◽  
R K Bagley ◽  
K L Thompson ◽  
C R Linnen
Keyword(s):  
Sex Determination ◽  
Inbreeding Depression ◽  
Inbreeding Avoidance ◽  
Complementary Sex Determination

scholarly journals Inbreeding Depression in a Parasitoid Wasp with Single-Locus Complementary Sex Determination

PLoS ONE ◽  
2014 ◽  
Vol 9 (6) ◽  
pp. e97733 ◽  
Author(s):  
Chloé Vayssade ◽  
Céline de Fazio ◽  
Bastien Quaglietti ◽  
Alexandra Auguste ◽  
Nicolas Ris ◽  
...  
Keyword(s):  
Sex Determination ◽  
Inbreeding Depression ◽  
Parasitoid Wasp ◽  
Single Locus ◽  
Complementary Sex Determination

scholarly journals Resolving the conundrum of inbreeding depression but no inbreeding avoidance: Estimating sex-specific selection on inbreeding by song sparrows (Melospiza melodia)

Evolution ◽  
2015 ◽  
Vol 69 (11) ◽  
pp. 2846-2861 ◽  
Author(s):  
Jane M. Reid ◽  
Peter Arcese ◽  
Greta Bocedi ◽  
A. Bradley Duthie ◽  
Matthew E. Wolak ◽  
...  
Keyword(s):  
Inbreeding Depression ◽  
Inbreeding Avoidance ◽  
Melospiza Melodia ◽  
Song Sparrows

scholarly journals Unusually High Recombination Rate Detected in the Sex Locus Region of the Honey Bee (Apis mellifera)

Genetics ◽  
1999 ◽  
Vol 153 (4) ◽  
pp. 1701-1708 ◽  
Author(s):  
Martin Beye ◽  
Greg J Hunt ◽  
Robert E Page ◽  
M Kim Fondrk ◽  
Lore Grohmann ◽  
...  
Keyword(s):  
Sex Determination ◽  
Physical Mapping ◽  
Recombination Rate ◽  
Heterozygote Advantage ◽  
Range Restriction ◽  
Group Iii ◽  
Single Sex ◽  
Complementary Sex Determination ◽  
Sex Locus ◽  
Map Distance

Abstract Sex determination in Hymenoptera is controlled by haplo-diploidy in which unfertilized eggs develop into fertile haploid males. A single sex determination locus with several complementary alleles was proposed for Hymenoptera [so-called complementary sex determination (CSD)]. Heterozygotes at the sex determination locus are normal, fertile females, whereas diploid zygotes that are homozygous develop into sterile males. This results in a strong heterozygote advantage, and the sex locus exhibits extreme polymorphism maintained by overdominant selection. We characterized the sex-determining region by genetic linkage and physical mapping analyses. Detailed linkage and physical mapping studies showed that the recombination rate is <44 kb/cM in the sex-determining region. Comparing genetic map distance along the linkage group III in three crosses revealed a large marker gap in the sex-determining region, suggesting that the recombination rate is high. We suggest that a “hotspot” for recombination has resulted here because of selection for combining favorable genotypes, and perhaps as a result of selection against deleterious mutations. The mapping data, based on long-range restriction mapping, suggest that the Q DNA-marker is within 20,000 bp of the sex locus, which should accelerate molecular analyses.

scholarly journals Wolbachia promote successful sex with siblings

2019 ◽  
Author(s):  
Zeynab Bagheri ◽  
Ali Asghar Talebi ◽  
Sassan Asgari ◽  
Mohammad Mehrabadi
Keyword(s):  
Inbreeding Depression ◽  
Adult Emergence ◽  
Fertilization Success ◽  
Inbreeding Avoidance ◽  
High Rate ◽  
Avoidance Behaviour ◽  
Female Progeny ◽  
Habrobracon Hebetor ◽  
Sibling Pairs ◽  
Sib Mating

AbstractWolbachia are intracellular α-proteobacteria that have a wide distribution among various arthropods and nematodes. They affect the host reproduction favoring their maternal transmission, which sets up a potential conflict in inbreeding situations when the host avoids sexual reproduction preventing inbreeding depression, while Wolbachia pushes it. In this study, we used the wasp Habrobracon hebetor to test the hypothesis that Wolbachia modulate inbreeding avoidance behaviour and promote sib mating. To test this, we first cured wasps of Wolbachia using tetracycline treatment and produced infected and uninfected isolines. Then, we paired the uninfected and infected females with sibling (inbred) and non-sibling (outbred) males in choice and non-choice experiments. Our results showed no obvious precopulatory inbreeding avoidance in this wasp as brother-sister mating rates (in both choice and nonchoice experiments) were not significantly different form non-sibling pairs, regardless of Wolbachia infection. However, our results indicated that H. hebetor shows a strong postcopulatory inbreeding avoidance behaviour that results in a low fertilization rate of uninfected siblings and therefore high rate of production of male progeny was obtained. We observed higher rates of fertilization success in the Wolbachia-infected lines that resulted in significantly higher female progeny production compared to the uninfected sib mates. Since diploid females are the result of successful fertilization due to haplodiploidy sex determination system in this insect, our results indicate that Wolbachia promoted fertile sib mating in H. hebetor. Interestingly, the rate of adult emergence in the progeny of Wolbachia-infected sib mates were almost similar to the non-sib mate crosses and significantly more than those observed in the uninfected sib mate crosses. We support the idea that Wolbachia modulate inbreeding avoidance and promote sib mating and also mitigate inbreeding depression. The wasp Habrobracon hebetor siblings infected with Wolbachia show higher rates of fertilization success and higher adult emergence rates compared to the uninfected sib mates. By promoting successful sex with siblings and increasing the probability of female progeny, Wolbachia enhance their transmission to the next generation and also mitigate inbreeding depression. This is an undescribed effect of Wolbachia (symbiont) on the host reproduction.

Human inbreeding avoidance: Culture in nature

1983 ◽  
Vol 6 (1) ◽  
pp. 91-102 ◽  
Author(s):  
Pierre L. van den Berghe
Keyword(s):  
Inbreeding Depression ◽  
Critical Period ◽  
Clinical Evidence ◽  
Inclusive Fitness ◽  
Inbreeding Avoidance ◽  
Fitness Costs ◽  
Optimal Balance ◽  
Social Animals ◽  
Close Inbreeding ◽  
Cultural Rules

AbstractMuch clinical and ethnographic evidence suggests that humans, like many other organisms, are selected to avoid close inbreeding because of the fitness costs of inbreeding depression. The proximate mechanism of human inbreeding avoidance seems to be precultural, and to involve the interaction of genetic predispositions and environmental conditions. As first suggested by E. Westermarck, and supported by evidence from Israeli kibbutzim, Chinese sim-pua marriage, and much convergent ethnographic and clinical evidence, humans negatively imprint on intimate associates during a critical period of early childhood (between ages 2 and 6).There is also much evidence that, like other social animals, humans do not seek to maximize outbreeding, but rather to maintain an optimal balance between outbreeding and inbreeding.Closeinbreeding reduces fitness through inbreeding depression, butsomeinbreeding brings the benefits of nepotism. For simple, stateless, horticultural societies, the optimal balance seems to be achieved by a combination of precultural inbreeding avoidance of relatives with anr≤·25 and cultural rules of preferential marriage with kin withr≥·25. Adjustment of the coefficient of inbreeding to other ecological settings seems to be largely cultural. An interactive model of “culture in nature” is presented, in which culture is seen as coevolving with genes to produce the maxiniization of individual inclusive fitness.

scholarly journals Single-locus complementary sex determination absent in Heterospilus prosopidis (Hymenoptera: Braconidae)

Heredity ◽  
2005 ◽  
Vol 95 (3) ◽  
pp. 228-234 ◽  
Author(s):  
Z Wu ◽  
K R Hopper ◽  
P J Ode ◽  
R W Fuester ◽  
M Tuda ◽  
...  
Keyword(s):  
Sex Determination ◽  
Single Locus ◽  
Complementary Sex Determination ◽  
Heterospilus Prosopidis
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