Assistant Laboratory Animal Technician (ALAT) Practice Exam

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What is the weight range of a newborn mouse in grams?

  1. 0.5-1 gram

  2. 1-1.5 grams

  3. 1.5-2 grams

  4. 2-3 grams

The correct answer is: 1-1.5 grams

The weight range of a newborn mouse is typically around 1 to 1.5 grams. This range is consistent with the average weights observed in laboratory mice shortly after birth. Newborn mice are altricial, meaning they are born in a very immature state and depend on their mother for warmth and nourishment. At birth, their size and weight can vary slightly, but the 1 to 1.5 grams range is widely accepted in scientific literature, reflecting the typical mass of these animals, which can help in standardizing research methodologies involving them. As they grow, their weight will increase significantly, but during the newborn stage, this specific weight range is representative of their developmental status.

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