Sexual isolation in two bee-pollinated Costus (Costaceae)

2012 ◽  
Vol 26 (1) ◽  
pp. 3-16 ◽  
Author(s):  
Grace F. Chen
Keyword(s):  
Sexual Isolation

The Effect of Mismatch Repair and Heteroduplex Formation on Sexual Isolation in Bacillus

Genetics ◽  
1998 ◽  
Vol 148 (1) ◽  
pp. 13-18 ◽  
Author(s):  
Jacek Majewski ◽  
Frederick M Cohan
Keyword(s):  
Mismatch Repair ◽  
Wild Type Strain ◽  
Resistance Mechanism ◽  
Sequence Divergence ◽  
Sexual Isolation ◽  
Wild Type ◽  
Exponential Relationship ◽  
Dna Strands ◽  
The Relationship ◽  
Heteroduplex Formation

AbstractIn Bacillus transformation, sexual isolation is known to be an exponential function of the sequence divergence between donor and recipient. Here, we have investigated the mechanism under which sequence divergence results in sexual isolation. We tested the effect of mismatch repair by comparing a wild-type strain and an isogenic mismatch-repair mutant for the relationship between sexual isolation and sequence divergence. Mismatch repair was shown to contribute to sexual isolation but was responsible for only a small fraction of the sexual isolation observed. Another possible mechanism of sexual isolation is that more divergent recipient and donor DNA strands have greater difficulty forming a heteroduplex because a region of perfect identity between donor and recipient is required for initiation of the heteroduplex. A mathematical model showed that this heteroduplex-resistance mechanism yields an exponential relationship between sexual isolation and sequence divergence. Moreover, this model yields an estimate of the size of the region of perfect identity that is comparable to independent estimates for Escherichia coli. For these reasons, and because all other mechanisms of sexual isolation may be ruled out, we conclude that resistance to heteroduplex formation is predominantly responsible for the exponential relationship between sexual isolation and sequence divergence in Bacillus transformation.

scholarly journals Genetics of sexual isolation in male hybrids of Drosophila simulans and D. mauritiana

1996 ◽  
Vol 68 (3) ◽  
pp. 211-220 ◽  
Author(s):  
Jerry A. Coyne
Keyword(s):  
Genetic Analysis ◽  
Y Chromosome ◽  
Sibling Species ◽  
Previous Analysis ◽  
Sexual Isolation ◽  
Drosophila Simulans

SummarySexual isolation between the sibling species D. simulans and D. mauritiana is due largely to the rejection of D. simulans males by D. mauritiana females. Genetic analysis shows that genes on the X and third chromosomes contribute to the differences between males causing sexual isolation, while the Y chromosome, second chromosome and cytoplasm have no effect. These chromosome effects differ from those observed in a previous analysis of sexual isolation in hybrid females, implying that different genes cause sexual isolation in the two sexes.

scholarly journals Quantitative Trait Loci for Sexual Isolation Between Drosophila simulans and D. mauritiana

Genetics ◽  
2004 ◽  
Vol 167 (3) ◽  
pp. 1265-1274 ◽  
Author(s):  
Amanda J. Moehring ◽  
Jian Li ◽  
Malcolm D. Schug ◽  
Shelly G. Smith ◽  
Matthew deAngelis ◽  
...  
Keyword(s):  
Quantitative Trait Loci ◽  
Quantitative Trait ◽  
Sexual Isolation ◽  
Drosophila Simulans ◽  
Trait Loci

Sexual isolation and courtship behavior inDrosophila simulans, D. mauritiana, and their interspecific hybrids

1988 ◽  
Vol 18 (2) ◽  
pp. 211-225 ◽  
Author(s):  
Matthew Cobb ◽  
Barrie Burnet ◽  
Kevin Connolly
Keyword(s):  
Interspecific Hybrids ◽  
Courtship Behavior ◽  
Sexual Isolation
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