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In the experiment of observing the meiosis of mouse cells, a small amount of tissues should be hypotonic when making slices. Why?
(1) Meiosis occurs during the formation of sexual germ cells, and meiosis is carried out in the gonads of animals, so the testicles of mice are used as experimental materials.

(2) During mitosis, the production steps are as follows: taking materials, dissociating, rinsing, dyeing, making and observing. Therefore, after hypotonic treatment, a small amount of tissue is put into the dissociation solution and washed gently after a certain period of time; When dyeing, dyeing with basic dye, that is, gentian violet solution in the material; After a period of time, cover glass is added and tabletted to make it a uniform single layer for easy observation.

(3) Spermatogonial cells can both undergo mitosis and meiosis, so the student found three kinds of metaphase cells with different characteristics, namely prophase metaphase cells, prophase metaphase cells and anaphase metaphase cells. They divide normally, and the daughter cells produced are spermatogonia, secondary spermatocytes and spermatocytes respectively.