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.

2011

“Genetics,Biotechnology”, Science and Technology

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.

(a)

1 and 2 only

(b)

2 only

(c)

1 and 3 only

(d)

1, 2 and 3

Answer:

(c)

Explanation

DNA sequencing allows us to know livestock pedigrees and develop disease-resistant animal breeds, but does not fully explain all human diseases.