A cell contains a diploid genome of 2N= 18 chromosomes, How many DNA molecules will be present in a cell during metaphase of mitosis?

Question

BlackTom AI · Accepted Answer

The question states a diploid genome with 2N = 18 chromosomes. In metaphase of mitosis, each chromosome has been replicated, resulting in two sister chromatids per chromosome. Each chromatid contains one DNA molecule, so the total number of DNA molecules equals 2 per chromosome. Calculating this gives 18 chromosomes × 2 DNA molecules per chromosome = 36 DNA molecules in the cell during metaphase.

Note that in G1 there would be 18 DNA molecules (one per chromosome before replication), and after replication in S phase the amount doubles to 36, which is maintained through metaphase and anaphase until sister chromatids separate in anaphase. Since the question specifies metaphase and a replicated diploid genome, 36 DNA molecules is the correct count.

A cell contains a diploid genome of 2N= 18 chromosomes, How many DNA molecules will be present in a cell during metaphase of mitosis? 单项选择题

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