At present, scientists can determine the arrangements or relative position of genes of DNA sequences on a chromosome. how does this knowledge benefit us ? 1. It is possible to know the pedigree of livestock. 2. It is possible to understand the causes of all human diseases. 3. It is possible to develop disease resistant animal breeds. Which of the statements given above is/ are correct?

Knowledge of gene arrangements and DNA sequences on chromosomes significantly benefits livestock management and animal breeding. Scientists use genetic markers and gene mapping to determine the pedigree of livestock, which is essential for tracking ancestry and maintaining genetic diversity [1]. Furthermore, identifying the specific location of genes on chromosomes allows for the development of disease-resistant animal breeds through marker-assisted selection (MAS) or genomic selection [1]. This process involves screening for genes that contribute to heightened resistance to diseases in unfavorable environments. However, while gene mapping helps identify the genetic basis of many conditions, it is not possible to understand the causes of all human diseases through this knowledge alone. Many diseases are caused by complex environmental factors, lifestyle, or non-genetic triggers that DNA sequencing cannot fully explain. Therefore, statements 1 and 3 are correct, while statement 2 is an overstatement.

Sources

1. [1] https://www.fao.org/4/a1120e/a1120e03.pdf