搜索结果: 1-15 共查到“生物学 selection”相关记录64条 . 查询时间(0.14 秒)
Bee competitive: Research reveals the impact of natural selection on nectar supply and demand
natural selection nectar supply and demand seasonal imbalances
2021/8/6
Theoretical research indicates that natural selection will increase existing seasonal imbalances between the supply of nectar from flowers and the demand from bees and other insects.
Lizard blizzard survivors tell story of natural selection（图）
Lizard blizzard survivors tell story natural selection
2017/9/4
An unusually cold winter in the U.S. in 2014 took a toll on the green anole lizard, a tree-dwelling creature common to the southeastern United States. A new study offers a rare view of natural selecti...
Factors Affecting the Incidence of Angel Wing in White Roman Geese: Stocking Density and Genetic Selection
Angel Wing Stocking Density Genetics White Roman Geese
2016/7/27
The present study investigated stocking density and genetic lines, factors that may alter the severity and incidence of angel wing (AW), in White Roman geese. Geese (n = 384) from two genetically sele...
Selection of Sahiwal Cattle Bulls on Pedigree and Progeny
Sahiwal Cattle Bull Selection Pedigree Progeny Milk Yield
2016/4/25
The objective of the study was to compare ranking of Sahiwal bulls selected on the basis of highest lactation milk yield of their dams with their estimated breeding values (EBVs) using an animal model...
Evolutionary Diversification of Multigene Families: Allelic Selection of Toxins in Predatory Cone Snails
Multigene Families Predatory Cone Snails
2015/12/17
In order to investigate the evolution of conotoxin multigene families among two closely related vermivorous Conus
species, we sequenced 104 four-loop conotoxin mRNAs from two individuals of Conus ebr...
The fossil record of marine gastropods has
been used as evidence to support the operation of species
selection; namely, that species with limited dispersal differentially increase in numbers because...
Genome-wide polymorphisms show unexpected targets of natural selection
population genomics natural selection
2015/12/11
Natural selection can act on all the expressed genes of an individual, leaving signatures of genetic differeniation or diversity at many loci across the genome. New power to assay these genome-wide ef...
The Selection and Validation of a Marker Set for the Differentiation of Onion Cultivars from the Czech Republic
genotyping SSR markers variety testing
2015/7/2
The onion (Allium cepa L.) constitutes an important part of the human diet and is of economic importance
on the vegetable market. Methods that allow unambiguous differentiation of cultivars and bree...
The Selection and Validation of a Marker Set for the Differentiation of Onion Cultivars from the Czech Republic
genotyping SSR markers variety testing
2015/7/2
The onion (Allium cepa L.) constitutes an important part of the human diet and is of economic importance
on the vegetable market. Methods that allow unambiguous differentiation of cultivars and bree...
Selection for Duration of Fertility and Mule Duck White Plumage Colour in a Synthetic Strain of Ducks (Anas platyrhynchos)
Duck Duration of Fertilization Fertility Selection Plumage Colour
2016/5/18
A synthetic strain of ducks (Anas platyrhynchos) was developed by introducing genes for long duration of fertility to be used as mother of mule ducklings and a seven-generation selection experiment wa...
Invertebrate Phenology and Prey Selection of Three Sympatric Species of Salmonids; Implications for Individual Fish Growth
Invertebrate Phenology Prey Selection Three Sympatric Species Salmonids Individual Fish Growth
2014/12/12
Growth plays an important roll in the survival of individual salmonid fish. Diet inevitably plays a significant role in the determination of salmonid growth, with these diets consisting primarily of a...
The role of cell cycle progression and cyclin -dependent kinase 2 in thymocyte negative selection
T cells and thymus cells thymus self antigen cells
2014/12/11
Autoreactive, immature T cells (thymocytes) are deleted from the thymus during development by the process of negative selection. This mechanism occurs when the thymocyte, T cell receptor (TCR) recogni...
The stability of T7 RNA polymerase elongation complexes and promoter function analysis by in vitro selection
Forward translocation model polymerase complex stability DNA structure
2014/12/11
The forward translocation model (paused or stalled polymerase moves forward in the absence of transcription, dissociation of the complex happens when hybrid is too short to stabilize the complex) is t...
Biologists Link Sexual Selection and Placenta Formation（图）
The placenta. Fish The peacock. Mammals Organs Out of nothing guppy
2014/7/18
RIVERSIDE, Calif. — Sexual selection refers to species’ selection for traits that are attractive to the opposite sex. This special type of natural selection enhances opportunities to mate, the tail of...
Genomic Selection for Adjacent Genetic Markers of Yorkshire Pigs Using Regularized Regression Approaches
Pig, Litter Size Single Nucleotide Polymorphism Regularized Regression
2016/5/17
This study considers a problem of genomic selection (GS) for adjacent genetic markers of Yorkshire pigs which are typically correlated. The GS has been widely used to efficiently estimate target varia...