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In the world maximum number of existing transgenic animals is mice.

1. In the world maximum number of existing transgenic animals is mice.
2. In the world maximum number of existing transgenic animals is rats.
3. In the world maximum number of existing transgenic animals is rabbits.
4. In the world maximum number of existing transgenic animals is guinea pigs.

Correct answer: In the world maximum number of existing transgenic animals is mice.

Solution

Mice are the most extensively used laboratory mammals for genetic modification because they reproduce quickly, are easy to maintain, and have well-developed genetic tools. That makes them the most common transgenic animals worldwide.

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