Which statement about knock-out mice is true?

Which statement about knock-out mice is true?

• A. They are developed without human intervention
• B. They cannot reproduce
• C. They are used to study loss of gene function
• D. They are primarily bred for their physical traits

Answer: (C)

Knock-out mice are specifically engineered to have certain genes intentionally inactivated or "knocked out," which allows researchers to study the effects of losing those specific genes. This genetic modification is a crucial tool in understanding gene function and the role that particular genes play in various biological processes and disease pathways. By observing the differences in behavior, physiology, and development between wild-type (normal) mice and knock-out mice, scientists can gain insights into the functions of the targeted genes, their contributions to specific traits, and related health conditions. In contrast, the other statements do not accurately reflect the characteristics or purposes of knock-out mice. The development of knock-out mice involves human intervention, as specific genetic alterations are made using techniques such as gene targeting in embryonic stem cells. While knock-out mice can face fertility issues related to specific genetic changes, it is not universally true that they cannot reproduce. Additionally, their primary aim is not to be bred for physical traits; rather, the focus is on understanding the biological implications of gene loss, making them invaluable in biomedical research rather than traditional breeding objectives.

Knock-out mice are specifically engineered to have certain genes intentionally inactivated or "knocked out," which allows researchers to study the effects of losing those specific genes. This genetic modification is a crucial tool in understanding gene function and the role that particular genes play in various biological processes and disease pathways. By observing the differences in behavior, physiology, and development between wild-type (normal) mice and knock-out mice, scientists can gain insights into the functions of the targeted genes, their contributions to specific traits, and related health conditions.

In contrast, the other statements do not accurately reflect the characteristics or purposes of knock-out mice. The development of knock-out mice involves human intervention, as specific genetic alterations are made using techniques such as gene targeting in embryonic stem cells. While knock-out mice can face fertility issues related to specific genetic changes, it is not universally true that they cannot reproduce. Additionally, their primary aim is not to be bred for physical traits; rather, the focus is on understanding the biological implications of gene loss, making them invaluable in biomedical research rather than traditional breeding objectives.