Lily plants sometimes have twice as many chromosomes per cell as their parent plants had. Which of the following explains how this might have happened?
a. The lily's sister chromatids failed to separate during meiosis.
b. The chromosome number of the lily went from 2n to n.
c. The lily gametes fused during mitosis.
d. The parent plant lost half of its chromosomes during mitosis.
Answer: a. The lily's sister chromatids failed to separate during meiosis.
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