Question

you have isolated dna from three different cell types of an organism, determined the relative dna content for each type, and plotted the results on the graph shown in the figure below. which sample(s) of dna might be from a germ cell arrested in prophase i of meiosis?
i
ii
either i or ii
both i and ii

Explanation:

Germ cells in prophase I of meiosis have undergone DNA replication (so their DNA content is double that of a non - replicating cell). In a diploid organism, a non - replicating cell has a DNA content of \(n\) (for example, if we consider the basic amount as \(2C\) in a diploid, after replication it is \(4C\)). Sample II has a higher DNA content compared to sample I. Sample I likely represents a non - replicating cell (\(2C\) in diploid terms), and sample II represents a cell that has replicated its DNA ( \(4C\) in diploid terms, which is the case for a germ cell in prophase I of meiosis as it has completed DNA replication).

Answer:

II