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Diploid nuclei of the ascomycete, Neurospora crassa, contain 14 chromosomes. A single diploid cell in an ascus will undergo one round of meiosis, followed in each of the daughter cells by one round of mitosis, producing a total of eight ascospores.
-Each of the eight ascospores present at the end of mitosis has the same chromosome number and DNA content (ng)as each of the four cells at the end of meiosis. What must have occurred in each spore between the round of meiosis and the round of mitosis?

Question

Quizplus · Accepted Answer

Each spore must have undergone DNA replication (S phase) before entering mitosis to maintain the same chromosome number and DNA content as the cells at the end of meiosis. Double fertilization, crossing over, nondisjunction, and autopolyploidy would have altered the chromosome number or DNA content, resulting in different spores.

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