The amount of nuclear DNA in a metaphase chromosome is

The correct answer is 2C

Explanation:

•  DNA content is measured in units called "C," where "C" refers to the amount of nuclear DNA in a haploid cell (e.g., a gamete).
• During the cell cycle, the DNA content changes as the cell progresses through different stages, such as interphase, mitosis, and cytokinesis.
• Metaphase is a stage of mitosis where chromosomes are fully condensed and aligned at the metaphase plate, preparing for segregation into daughter cells.
• During metaphase, the cell is in the mitotic phase where chromosomes are duplicated and consist of two sister chromatids joined at the centromere.
• Each chromosome contains twice the amount of DNA compared to a haploid cell (1C), making the total DNA content 2C.
• This oc curs because DNA replication in the S phase of interphase has already taken place, doubling the DNA content in preparation for division.