Assistant Laboratory Animal Technician (ALAT) Practice Exam

Which rat strain is characterized by being albino with a wide head and long ears?

1. Sprague-Dawley

2. Fischer

3. Wistar

4. Long-Evans

The correct answer is: Wistar

The Wistar rat strain is indeed recognized for its distinctive characteristics, including its albino coat, wide head, and long ears. This strain is frequently used in biomedical research due to its calm disposition and adaptability, which makes it an ideal subject for various experimental studies. Wistar rats are often bred for their specific traits, including the noticeable morphology of their heads and ears, which sets them apart from other strains. These features not only contribute to their unique appearance but also play a role in their use in scientific research, as their physical and genetic uniformity can be beneficial for experimental consistency. In contrast, other rat strains possess different characteristics. For instance, Sprague-Dawley rats are also albino but have a more elongated body and a different head shape. Fischer rats are known for their specific genetic lineage and often exhibit darker fur compared to albino strains. Long-Evans rats, while having darker markings, are easily identified by their hooded coloration which does not fit the description of being entirely albino with a wide head and long ears. In research contexts, understanding these distinctions is crucial for selecting the appropriate strain for an experiment, as the strain can impact study outcomes. Thus, the identification and knowledge of the Wistar rat's unique traits