
Concept explainers
You study a gene known to be important in the early stages of heart development. Loss of the gene is also suspected to play a role in triggering lung cancer. What kind of transgenic mouse would you use to study your gene in vivo?
a. Knockout
b. Knockin
c. Conditional knockout
d. All of the choices are correct.

Introduction:
Transgenic organisms contain a gene called transgene from different species, which is incorporated into their genetic composition through genetic engineering. The technique of genetic engineering also allows removal and change of gene as well.
Answer to Problem 1U
Correct answer:
Study on a gene that is known to be important in the early stages of heart development. Loss of the gene may trigger cancer. Conditional knockout is the kind of transgenic mouse that an individual would use to study that gene in vivo. Therefore, Option c. is correct.
Explanation of Solution
Reason for the correct statement:
Conditional gene knockout is a technique that is used to eliminate a specific gene present in the genome to study its effect on the development stages of the organism.
Option c. is given as “Conditional Knockout”.
As, “to study the effect of a gene that is known to be important in the early developmental stages of heart, conditional knockout transgenic mouse would be used” is the right answer.
Hence, Option c. is correct.
Reasons for the incorrect statements:
Option a. is given as “Knockout”.
Gene knockout is a technique that inactivates the gene, which results in loss of its functionality. Therefore, it is a wrong answer.
Option b. is given as “Knockin”.
Gene Knockin is a technique that includes replacement of the normal gene with the gene that has specific alterations. Therefore, it is a wrong answer.
Option d. is given as “All of the choices are correct”.
The study of the gene that has an important function whose loss leads to disease conditions can be done by a conditional knockout technique and not by knockout or knock-in technique. Since conditional knockout is the correct option, Option d is a wrong answer.
Hence, Options a., b., and d. are incorrect.
Conclusion:
Conditional knockout is a genetic engineering method that is used to eliminate a specific gene so that its effect can be studied.
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Chapter 17 Solutions
Biology
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