نتایج جستجو برای: direct selection
تعداد نتایج: 729444 فیلتر نتایج به سال:
To improve a complex character such as yield with low heritability, the use of indirect selection through other characters and a selection index based on different effective traits is recommended. This study was conducted to evaluate different selection methods by using 23 F2:4 wheat lines derived from the cross of Virmarin (susceptible cultivar) and Sardari (tolerant cultivar) at Research Farm...
Introduction: Ability of tooth shade segregation by A dentists is very important. Assessment of tooth shade selection by dentists is one of the most basic investigations. In this survey, dentistry students’ ability of tooth shade selection and their progress by education was evaluated. Methods: This study was done on 59 Dentistry Students of Shahid Sadoughi Dental School of Yazd. 32 of the stu...
Section 1. Direct frequency-dependent selection (on any gene) generated by migration between two demes with different environments is negatively correlated with allele frequency. Section 2. Direct frequency-dependent selection is also generated by migration between demes with different environments if migration takes place before selection. Section 3. Dependence of parasite equilibrium allele f...
An experiment involving crosses among selection and control lines was conducted to partition direct and maternal additive genetic response to 20 yr of selection for 1) weaning weight (WWL), 2) yearling weight (YWL), and 3) an index of yearling weight and muscle score (IXL). Maternal response was estimated from reciprocal crosses among unselected sires and dams of control (CTL) and the selection...
6 Trait selection has received considerable attention in the pursuit to understand niche-based community 7 assembly processes and to generate ecological predictions. To further advance the study of trait selection, 8 a conceptual statistical model is presented that outlines and discuss the possibilities of i) estimating the 9 effect of interspecific interactions on traits rather than just testi...
6 Trait selection has received considerable attention in the pursuit to understand niche-based community 7 assembly processes and to generate ecological predictions. To further advance the study of trait selection, 8 a conceptual statistical model is presented that outlines and discuss the possibilities of i) estimating the 9 effect of interspecific interactions on traits rather than just testi...
Direct selection for litter size was compared with selection for ovulation rate, ova success, or uterine capacity and for indexes of ovulation rate with ova success or uterine capacity. Selection was simulated for 10 generations in a mouse population based on a model integrating ovulation rate, potential embryonic viability, and uterine capacity. Two indexes including ovulation rate (OR) and ov...
یکی از علت های شکست و عدم موفقیت در تکنیک های کمک باروری(art) قطعه قطعه شدن dna اسپرم انسانی است، که ممکن است با انکوباسیون طولانی مدت اسپرم در دمای 37 درجه سانتی گراد به وجود آید. لذا در این مطالعه میزان قطعه قطعه شدن و آپوپتوز dna اسپرم انسانی بعد از آماده سازی به روش direct swim-up در زمان های مختلف انکوباسیون به وسیله تست scd و تکنیک tunel مورد ارزیابی قرار گرفت. در این مطالعه آینده نگر، ب...
The advent of multiple regression analyses of natural selection has facilitated estimates of both the direct and indirect effects of selection on many traits in numerous organisms. However, low power in selection studies has possibly led to a bias in our assessment of the levels of selection shaping natural populations. Using calculations and simulations based on the statistical properties of s...
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