heterosis

简明释义

英[ˌhetəˈrəʊsɪs]美[ˌhetəˈroʊsɪs]

n. [遗] 杂种优势

复 数 h e t e r o s e s

英英释义

单词用法

同义词

反义词

例句

1.Heterosis of seed yield and its components of 66 crosses, from a diallel cross design of 12 parental varieties of Brassica napus L. were studied.

应用双列杂交设计，研究了遗传来源不同的12个甘蓝型油菜品种间66个双列组合的单株籽粒产量及产量性状的杂种优势。

2.Based on the results, the pollination methods and techniques on seed works of cotton heterosis utilization was discussed.

依据本试验结果，就棉花杂优利用制种工作的授粉方法及技术进行讨论。

3.Heterosis and segregation on agronomic and yield traits in brassica napus l.

甘蓝型油菜主要农艺和产量性状的杂种优势及其分离世代的分析。

4.The epistatic effects could not be ignored in tobacco breeding. They were one of main causes of heterosis for most characters.

互作效应普遍存在，是烟草性状杂种优势表现的主要原因之一。

5.In addition, we correlated the concurrence of DG and yield-related quantitative trait loci, providing a potential group of heterosis-related genes.

此外，还发现这些DG往往被定位到和产量相关的数量性状座位上，这为我们提供了潜在的杂种优势基因。

6.This heterosis could be predicted by the resistance of their parents.

这种优势可依亲本的抗性进行预测。

7.The selection of interspecific combinations with powerful heterosis is still an effective way so far to raise the yield of hybrid rice.

选育强优势的品种间组合仍是进一步提高杂交水稻产量的一条有效途径。

8.There are two ways in utilization of heterosis in rapeseed.

油菜杂种优势利用途径主要有三系法和两系法。

9.Understanding the mechanisms of heterosis 杂交优势 can lead to better crop management strategies.

理解heterosis 杂交优势的机制可以导致更好的作物管理策略。

10.Farmers often prefer hybrid seeds because they exhibit heterosis 杂交优势 and are more resilient to diseases.

农民通常更喜欢杂交种子，因为它们表现出heterosis 杂交优势，并且对疾病更具抵抗力。

11.Researchers are studying the genetic basis of heterosis 杂交优势 to improve livestock breeding programs.

研究人员正在研究heterosis 杂交优势的遗传基础，以改善畜牧育种计划。

12.The increased growth rate observed in the hybrid plants is a clear example of heterosis 杂交优势.

在杂交植物中观察到的生长速率增加是heterosis 杂交优势的明确例子。

13.The phenomenon of heterosis 杂交优势 is often utilized in agriculture to produce hybrid crops with higher yields.

在农业中，heterosis 杂交优势现象常被用来生产具有更高产量的杂交作物。

作文

Heterosis, often referred to as hybrid vigor, is a fascinating phenomenon observed in the fields of genetics and agriculture. It describes the improved or enhanced biological function that occurs when individuals from different genetic backgrounds are crossed. This concept has significant implications for crop production, livestock breeding, and even conservation biology. The term heterosis (杂种优势) encapsulates the idea that hybrid organisms often exhibit superior qualities compared to their parent strains. For instance, in agriculture, farmers frequently cross different varieties of plants to produce hybrids that yield more fruit, resist diseases better, or adapt more effectively to environmental stresses.One of the most striking examples of heterosis (杂种优势) can be seen in corn (maize) production. Hybrid corn varieties have been developed that outperform their inbred parents in terms of yield and resilience. This increase in productivity is not merely a result of chance; it is grounded in the genetic diversity that hybridization brings. The combination of different alleles from the parent strains can lead to increased growth rates, higher resistance to pests, and better adaptability to varying climatic conditions.In livestock breeding, heterosis (杂种优势) plays a crucial role as well. By crossing different breeds of cattle, for example, breeders can produce offspring that grow faster and have better reproductive performance than their purebred counterparts. This practice not only enhances productivity but also helps to maintain genetic diversity within livestock populations, which is vital for their long-term sustainability.The mechanisms behind heterosis (杂种优势) are complex and involve multiple genetic factors. One explanation is the dominance hypothesis, which suggests that the hybrid offspring benefit from the masking of deleterious recessive alleles present in the inbred parents. Another theory is the overdominance hypothesis, which posits that certain gene combinations in hybrids may produce traits that are more advantageous than those found in either parent. Regardless of the underlying mechanisms, the observable benefits of heterosis (杂种优势) are undeniable and are actively exploited in various breeding programs.However, the application of heterosis (杂种优势) is not without its challenges. While hybrid vigor can lead to remarkable improvements, there is also the risk of losing desirable traits that may be present in the parent strains. Additionally, reliance on hybrid varieties can lead to a reduction in genetic diversity over time, making crops and livestock more susceptible to diseases and changing environmental conditions. Therefore, it is essential for breeders and farmers to strike a balance between utilizing heterosis (杂种优势) and preserving genetic diversity.In conclusion, heterosis (杂种优势) is a powerful tool in the fields of agriculture and animal husbandry. It allows for the enhancement of desirable traits, leading to increased productivity and resilience. Understanding and harnessing this genetic phenomenon is crucial for future food security and sustainable agricultural practices. As we continue to explore the complexities of genetics, the potential of heterosis (杂种优势) will undoubtedly play a pivotal role in shaping the future of our food systems.