At present, scientists can determine the arrangement or relative positions of genes or 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?

QUESTION

Easy

Science & Technology

Prelims 2011

At present, scientists can determine the arrangement or relative positions of genes or DNA sequences on a chromosome. How does this knowledge benefit us?

It is possible to know the pedigree of livestock.
It is possible to understand the causes of all human diseases.
It is possible to develop disease-resistant animal breeds.

Which of the statements given above is/are correct?

Select an option to attempt

Explanation

Statement 1 is Correct: Gene mapping and DNA sequencing allow scientists to identify specific genetic markers, which are used for parentage testing and tracing the ancestry or pedigree of livestock animals.

Statement 2 is Incorrect: While gene mapping helps identify the basis of hereditary disorders, it cannot explain the causes of all human diseases. Many diseases are caused by external factors such as pathogens (viruses, bacteria), environmental exposure, and lifestyle choices, which are not encoded in the human DNA sequence.

Statement 3 is Correct: By identifying the specific genes or DNA sequences responsible for immunity or susceptibility, scientists can use selective breeding or genetic engineering to develop animal breeds that are naturally resistant to certain diseases.

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