back cross

简明释义

回交

英英释义

例句

1.The researchers conducted a back cross to analyze the genetic variation in the population.

研究人员进行了回交以分析种群中的遗传变异。

2.A successful back cross can lead to offspring that exhibit traits from both parents.

成功的回交可以导致后代表现出来自两个父母的特征。

3.Using a back cross technique can help in stabilizing desired characteristics in plant breeding.

使用回交技术可以帮助植物育种中稳定所需特性。

4.The farmer decided to perform a back cross to improve the yield of his crop.

农民决定进行一次回交以提高作物的产量。

5.In genetics, a back cross is often used to determine the traits of offspring by mating them with one of their parents.

在遗传学中，回交通常用于通过将后代与其一个父母交配来确定后代的特征。

作文

In the world of genetics, the term back cross refers to a specific breeding technique used to introduce desired traits into a population. This method involves crossing a hybrid organism with one of its parents or an individual genetically similar to its parent. The purpose of a back cross is to reinforce certain characteristics while minimizing undesirable traits that may have arisen in the hybrid offspring. This technique is widely utilized in agriculture and animal breeding, where maintaining specific traits is crucial for productivity and quality.For example, consider a scenario where a farmer wishes to enhance the disease resistance of a particular crop variety. The farmer might first cross the resistant variety with another type that has desirable yield characteristics. The resulting hybrid may possess both traits; however, it could also exhibit some unwanted characteristics from the non-resistant parent. To counteract this, the farmer would perform a back cross by mating the hybrid offspring with the original resistant variety. This process increases the likelihood that the next generation will inherit the resistance trait while retaining the improved yield features.The back cross method is not only beneficial in plants but is also extensively applied in animal breeding. For instance, breeders often seek to improve specific traits in livestock, such as milk production in cows or growth rate in chickens. By utilizing a back cross, they can ensure that the offspring maintain the advantageous traits of the high-performing parent while reducing the genetic variation introduced by other breeds.However, it is essential to approach back cross techniques with caution. Over-reliance on this method can lead to a reduction in genetic diversity, which may make populations more susceptible to diseases or environmental changes. Therefore, while back cross is an effective tool for enhancing specific traits, it should be balanced with strategies that promote genetic variation.In conclusion, the back cross breeding technique plays a vital role in modern genetics, particularly in agriculture and animal husbandry. It allows breeders to fine-tune specific traits, ensuring that crops and livestock meet the demands of a changing world. Nevertheless, it is crucial to use this method judiciously to maintain a healthy level of genetic diversity within populations. As we continue to explore the complexities of genetics, understanding and applying techniques like back cross will be key to achieving sustainable agricultural practices and improving food security worldwide.

在遗传学的世界中，术语回交指的是一种特定的育种技术，用于将所需特征引入一个群体。这种方法涉及将一个杂交生物与其父母之一或与其父母基因相似的个体进行交配。回交的目的是增强某些特征，同时尽量减少在杂交后代中可能出现的不良特征。这种技术在农业和动物育种中被广泛应用，因为保持特定特征对于生产力和质量至关重要。例如，考虑一个农民希望提高特定作物品种的抗病能力的情景。农民可能首先将抗病品种与具有理想产量特征的另一种类型进行交配。得到的杂交体可能同时具有这两种特征；然而，它也可能表现出来自非抗病亲本的一些不良特征。为了对抗这一点，农民将通过将杂交后代与原始抗病品种进行交配来执行回交。这个过程增加了下一代继承抗病特征的可能性，同时保留了改进的产量特征。回交方法不仅在植物中有益，而且在动物育种中也得到了广泛应用。例如，育种者通常寻求改善家畜的特定特征，例如奶牛的奶产量或鸡的生长速度。通过利用回交，他们可以确保后代保留高产亲本的有利特征，同时减少其他品种引入的遗传变异。然而，使用回交技术时必须谨慎。过度依赖这种方法可能导致遗传多样性的减少，这可能使种群更容易受到疾病或环境变化的影响。因此，虽然回交是增强特定特征的有效工具，但应与促进遗传变异的策略相结合。总之，回交育种技术在现代遗传学中发挥着至关重要的作用，特别是在农业和动物饲养业中。它允许育种者微调特定特征，以确保作物和家畜满足不断变化的世界的需求。然而，明智地使用这种方法以保持种群内健康的遗传多样性至关重要。随着我们继续探索遗传学的复杂性，理解和应用像回交这样的技术将是实现可持续农业实践和提高全球粮食安全的关键。