Question

where do the microtubules of the spindle originate during mitosis in animal cells?

centromere
kinetochore
centriole
centrosome
chromatid

Explanation:

In animal cells, during mitosis, the microtubules of the spindle originate from the centrosome. The centrosome is an organelle that serves as the main microtubule - organizing center. The centromere is the region of a chromosome where the two sister chromatids are joined. The kinetochore is a protein structure on the centromere that attaches to the spindle microtubules. Centrioles are part of the centrosome (in animal cells, the centrosome contains a pair of centrioles), but it is the centrosome as a whole that is the origin of spindle microtubules. A chromatid is one of the two identical halves of a replicated chromosome.

Answer:

centrosome