Anaphase of mitosis occurs when:
a) the chromatids begin to separate from the metaphase plate.
b) the sister chromatids from the homologous pairs of chromosomes come together as a tetrad.
c) crossing over begins.
d) the nuclear envelope re-forms.
e) the chromatin coils into thicker, visible chromatids.
Answer: a) the chromatids begin to separate from the metaphase plate.