scholarly journals Floral Evolution: Breeding Systems, Pollinators, and Beyond

2019 ◽  
Vol 180 (9) ◽  
pp. 929-933 ◽  
Author(s):  
Yuval Sapir ◽  
Johanne Brunet ◽  
Diane L. Byers ◽  
Eric Imbert ◽  
Jürg Schönenberger ◽  
...  
Keyword(s):  
Floral Evolution ◽  
Breeding Systems

Analysis of the effectiveness of Landrace families pigs breeding systems

2017 ◽  
Vol 1 (68) ◽  
pp. 153-157
Author(s):  
Natalia Lyashenko ◽  
◽  
Alexander Jarmoc ◽  
Maria Galicheva ◽  
Irina Tletseruk ◽  
...  
Keyword(s):  
Breeding Systems

scholarly journals DNA Polymorphism in Lycopersicon and Crossing-Over per Physical Length

Genetics ◽  
1998 ◽  
Vol 150 (4) ◽  
pp. 1585-1593 ◽  
Author(s):  
Wolfgang Stephan ◽  
Charles H Langley
Keyword(s):  
Dna Sequence ◽  
Dna Polymorphism ◽  
Sequence Polymorphism ◽  
Breeding Systems ◽  
Crossing Over ◽  
Physical Length ◽  
Interspecific Divergence ◽  
Dna Sequence Polymorphism ◽  
Outcrossing Species ◽  
Genomic Regions

Abstract Surveys in Drosophila have consistently found reduced levels of DNA sequence polymorphism in genomic regions experiencing low crossing-over per physical length, while these same regions exhibit normal amounts of interspecific divergence. Here we show that for 36 loci across the genomes of eight Lycopersicon species, naturally occurring DNA polymorphism (scaled by locus-specific divergence between species) is positively correlated with the density of crossing-over per physical length. Large between-species differences in the amount of DNA sequence polymorphism reflect breeding systems: selfing species show much less within-species polymorphism than outcrossing species. The strongest association of expected heterozygosity with crossing-over is found in species with intermediate levels of average nucleotide diversity. All of these observations appear to be in qualitative agreement with the hitchhiking effects caused by the fixation of advantageous mutations and/or “background selection” against deleterious mutations.

scholarly journals The role of historical factors and natural selection in the evolution of breeding systems of Oxalis alpina in the Sonoran desert ‘Sky Islands’

2010 ◽  
Vol 23 (10) ◽  
pp. 2163-2175 ◽  
Author(s):  
J. PÉREZ-ALQUICIRA ◽  
F. E. MOLINA-FREANER ◽  
D. PIÑERO ◽  
S. G. WELLER ◽  
E. MARTÍNEZ-MEYER ◽  
...  
Keyword(s):  
Natural Selection ◽  
Sonoran Desert ◽  
Breeding Systems ◽  
Sky Islands ◽  
Historical Factors

A simulation study of open nucleus and closed nucleus breeding systems in a sheep population

1995 ◽  
Vol 60 (1) ◽  
pp. 117-124 ◽  
Author(s):  
J. A. Roden
Keyword(s):  
Genetic Gain ◽  
Live Weight ◽  
Breeding Systems ◽  
Breeding Value ◽  
Linear Unbiased Prediction ◽  
Sheep Population ◽  
Best Linear Unbiased ◽  
Nucleus Breeding ◽  
Open Nucleus ◽  
Selection Of

AbstractStochastic simulation was used to compare the results of alternative breeding systems in a sheep population divided into 10 flocks of 120 ewes. The breeding systems compared were selection within closed flocks (CF), a closed nucleus system (CNS), an open nucleus system (ONS) and open nucleus systems with the selection of nucleus replacements being restricted to either nucleus born males (ONSRm) or nucleus born females (ONSRf). Selection was for a best linear unbiased prediction of breeding value for lamb live weight which had a heritability of 0·17. The open nucleus breeding systems (ONS, ONSRm, ONSRf) resulted in higher rates of genetic gain, more predictable selection responses and lower rates of inbreeding than either the closed nucleus system (CNS) or selection within closed flocks (CF). Initial genetic differences between flocks resulted in higher rates of genetic gain in the nucleus breeding systems due to the use of between flock genetic variance. In the ONS system up to 25% of nucleus sires and approximately 50% of nucleus dams were born in base flocks. Nevertheless if selection of either nucleus sires or dams was restricted to nucleus born animals there was very little change in genetic gain or rate of inbreeding.

Floral evolution as a figment of the imagination of pollinators

2010 ◽  
Vol 25 (7) ◽  
pp. 382-383 ◽  
Author(s):  
Florian P. Schiestl ◽  
Steven D. Johnson ◽  
Robert A. Raguso
Keyword(s):  
Floral Evolution
Sign in / Sign up

Export Citation Format

Share Document