Introduction:
Recombinant DNA is defined as the joining of two different DNA from two different species and then the integrated DNA transformed into the host. This technology is termed as recombinant DNA technology and used in science, medicine and agriculture.
Answer to Problem 1U
Correct answer:
A recombinant DNA molecule is constructed from DNA from different sources. Therefore, option (b) is correct.
Option (b) is given as “constructed from DNA from different sources”.
Explanation of Solution
Justify reason for the correct statement:
Recombinant DNA technology also known as genetic engineering is a technique that involves alteration of genotypes as well as
Hence, option (b) is correct.
Justify reasons for the incorrect statements:
Option (a) is given as “produced through the process of crossing over that occurs in meiosis”.
The DNA that is formed after meiosis has undergone crossing over but the source of DNA (parent cell) is same while recombinant DNA is constructed by using DNA from different sources. Hence, it is a wrong answer.
Option (c) is given as “constructed from novel combinations of DNA from the same source”.
DNA from same source is not used in recombinant DNA technology. Hence, it is a wrong answer.
Option (d) is given as “produced through mitotic cell division”.
Mitotic cell division results in same kind of DNA which cannot be used in recombinant technique. Hence, it is a wrong answer.
Hence, options (a), (c), and (d) are incorrect.
Construction of recombinant DNA requires DNA from different sources.
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