The world of genes Since the 1920s, the use of genetics to grow new strains of plants and animals has brought substantial changes in agriculture. Only at the beginning of the 20th century was genetics developed as a science dealing with the concepts of heredity and variation in plants and animals. Later came its application to practical issues. Extremely stable are the chromosomes. However, means of assortment, segregation, and recombination of genetic factors are present during sexual reproduction processes. Thus, within a population, enormous genetic diversity is provided. In order to adapt it to particular applications, this variability makes possible the improvements that can be made within a species. Variability is often contributed by occasional mutations (spontaneous changes) in genes. Of course, the study of genetics did not await the creation of new strains of plants and animals, and some advances were made by observational methods even after the application of genetic sc...
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