Which animal species accounts for approximately 95% of all existing transgenic animals?

mice

The correct answer is Option (3)- Mice

Transgenic animals are those whose DNA has been manipulated to include and express foreign genes, i.e., genes from a different species. This genetic modification is typically achieved through techniques like gene insertion or gene editing.

Scientists have successfully created transgenic animals of various species, such as rats, rabbits, pigs, sheep, cows, and fish. Each of these animals has been modified to carry and express specific genes that bestow desired traits or characteristics. These genetically engineered animals serve as valuable models for studying human diseases, understanding gene functions, and producing beneficial substances like pharmaceutical proteins.

Despite the successful creation of transgenic animals across different species, mice have emerged as the most prevalent among them. Over 95% of all existing transgenic animals are mice.