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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.
-If a single, diploid G₂ nucleus in an ascus contains 400 nanograms (ng)of DNA, then a single ascospore nucleus of this species should contain how much DNA (ng), carried on how many chromosomes?

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In G2 phase, the DNA content is doubled, so a diploid cell originally with 200 ng of DNA would have 400 ng. After meiosis, the DNA content is halved in each daughter cell, resulting in 200 ng per cell. A subsequent round of mitosis does not change the DNA content but doubles the number of cells, so each ascospore (having undergone both meiosis and mitosis) would have 100 ng of DNA. Since meiosis halves the chromosome number, each ascospore would have 7 chromosomes, the haploid number for Neurospora crassa.

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